Douglas Gregor | 2b1ad8b | 2011-06-23 00:49:38 +0000 | [diff] [blame] | 1 | //===--- SemaExprMember.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 member access expressions. |
| 11 | // |
| 12 | //===----------------------------------------------------------------------===// |
| 13 | #include "clang/Sema/SemaInternal.h" |
| 14 | #include "clang/Sema/Lookup.h" |
| 15 | #include "clang/Sema/Scope.h" |
| 16 | #include "clang/AST/DeclCXX.h" |
| 17 | #include "clang/AST/DeclObjC.h" |
| 18 | #include "clang/AST/DeclTemplate.h" |
| 19 | #include "clang/AST/ExprCXX.h" |
| 20 | #include "clang/AST/ExprObjC.h" |
| 21 | #include "clang/Lex/Preprocessor.h" |
| 22 | |
| 23 | using namespace clang; |
| 24 | using namespace sema; |
| 25 | |
| 26 | /// Determines if the given class is provably not derived from all of |
| 27 | /// the prospective base classes. |
| 28 | static bool IsProvablyNotDerivedFrom(Sema &SemaRef, |
| 29 | CXXRecordDecl *Record, |
| 30 | const llvm::SmallPtrSet<CXXRecordDecl*, 4> &Bases) { |
| 31 | if (Bases.count(Record->getCanonicalDecl())) |
| 32 | return false; |
| 33 | |
| 34 | RecordDecl *RD = Record->getDefinition(); |
| 35 | if (!RD) return false; |
| 36 | Record = cast<CXXRecordDecl>(RD); |
| 37 | |
| 38 | for (CXXRecordDecl::base_class_iterator I = Record->bases_begin(), |
| 39 | E = Record->bases_end(); I != E; ++I) { |
| 40 | CanQualType BaseT = SemaRef.Context.getCanonicalType((*I).getType()); |
| 41 | CanQual<RecordType> BaseRT = BaseT->getAs<RecordType>(); |
| 42 | if (!BaseRT) return false; |
| 43 | |
| 44 | CXXRecordDecl *BaseRecord = cast<CXXRecordDecl>(BaseRT->getDecl()); |
| 45 | if (!IsProvablyNotDerivedFrom(SemaRef, BaseRecord, Bases)) |
| 46 | return false; |
| 47 | } |
| 48 | |
| 49 | return true; |
| 50 | } |
| 51 | |
| 52 | enum IMAKind { |
| 53 | /// The reference is definitely not an instance member access. |
| 54 | IMA_Static, |
| 55 | |
| 56 | /// The reference may be an implicit instance member access. |
| 57 | IMA_Mixed, |
| 58 | |
| 59 | /// The reference may be to an instance member, but it is invalid if |
| 60 | /// so, because the context is not an instance method. |
| 61 | IMA_Mixed_StaticContext, |
| 62 | |
| 63 | /// The reference may be to an instance member, but it is invalid if |
| 64 | /// so, because the context is from an unrelated class. |
| 65 | IMA_Mixed_Unrelated, |
| 66 | |
| 67 | /// The reference is definitely an implicit instance member access. |
| 68 | IMA_Instance, |
| 69 | |
| 70 | /// The reference may be to an unresolved using declaration. |
| 71 | IMA_Unresolved, |
| 72 | |
| 73 | /// The reference may be to an unresolved using declaration and the |
| 74 | /// context is not an instance method. |
| 75 | IMA_Unresolved_StaticContext, |
| 76 | |
| 77 | /// All possible referrents are instance members and the current |
| 78 | /// context is not an instance method. |
| 79 | IMA_Error_StaticContext, |
| 80 | |
| 81 | /// All possible referrents are instance members of an unrelated |
| 82 | /// class. |
| 83 | IMA_Error_Unrelated |
| 84 | }; |
| 85 | |
| 86 | /// The given lookup names class member(s) and is not being used for |
| 87 | /// an address-of-member expression. Classify the type of access |
| 88 | /// according to whether it's possible that this reference names an |
| 89 | /// instance member. This is best-effort; it is okay to |
| 90 | /// conservatively answer "yes", in which case some errors will simply |
| 91 | /// not be caught until template-instantiation. |
| 92 | static IMAKind ClassifyImplicitMemberAccess(Sema &SemaRef, |
| 93 | Scope *CurScope, |
| 94 | const LookupResult &R) { |
| 95 | assert(!R.empty() && (*R.begin())->isCXXClassMember()); |
| 96 | |
| 97 | DeclContext *DC = SemaRef.getFunctionLevelDeclContext(); |
| 98 | |
| 99 | bool isStaticContext = |
| 100 | (!isa<CXXMethodDecl>(DC) || |
| 101 | cast<CXXMethodDecl>(DC)->isStatic()); |
| 102 | |
| 103 | // C++0x [expr.prim]p4: |
| 104 | // Otherwise, if a member-declarator declares a non-static data member |
| 105 | // of a class X, the expression this is a prvalue of type "pointer to X" |
| 106 | // within the optional brace-or-equal-initializer. |
| 107 | if (CurScope->getFlags() & Scope::ThisScope) |
| 108 | isStaticContext = false; |
| 109 | |
| 110 | if (R.isUnresolvableResult()) |
| 111 | return isStaticContext ? IMA_Unresolved_StaticContext : IMA_Unresolved; |
| 112 | |
| 113 | // Collect all the declaring classes of instance members we find. |
| 114 | bool hasNonInstance = false; |
| 115 | bool hasField = false; |
| 116 | llvm::SmallPtrSet<CXXRecordDecl*, 4> Classes; |
| 117 | for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { |
| 118 | NamedDecl *D = *I; |
| 119 | |
| 120 | if (D->isCXXInstanceMember()) { |
| 121 | if (dyn_cast<FieldDecl>(D)) |
| 122 | hasField = true; |
| 123 | |
| 124 | CXXRecordDecl *R = cast<CXXRecordDecl>(D->getDeclContext()); |
| 125 | Classes.insert(R->getCanonicalDecl()); |
| 126 | } |
| 127 | else |
| 128 | hasNonInstance = true; |
| 129 | } |
| 130 | |
| 131 | // If we didn't find any instance members, it can't be an implicit |
| 132 | // member reference. |
| 133 | if (Classes.empty()) |
| 134 | return IMA_Static; |
| 135 | |
| 136 | // If the current context is not an instance method, it can't be |
| 137 | // an implicit member reference. |
| 138 | if (isStaticContext) { |
| 139 | if (hasNonInstance) |
| 140 | return IMA_Mixed_StaticContext; |
| 141 | |
| 142 | if (SemaRef.getLangOptions().CPlusPlus0x && hasField) { |
| 143 | // C++0x [expr.prim.general]p10: |
| 144 | // An id-expression that denotes a non-static data member or non-static |
| 145 | // member function of a class can only be used: |
| 146 | // (...) |
| 147 | // - if that id-expression denotes a non-static data member and it |
| 148 | // appears in an unevaluated operand. |
| 149 | const Sema::ExpressionEvaluationContextRecord& record |
| 150 | = SemaRef.ExprEvalContexts.back(); |
| 151 | bool isUnevaluatedExpression = (record.Context == Sema::Unevaluated); |
| 152 | if (isUnevaluatedExpression) |
| 153 | return IMA_Mixed_StaticContext; |
| 154 | } |
| 155 | |
| 156 | return IMA_Error_StaticContext; |
| 157 | } |
| 158 | |
| 159 | CXXRecordDecl *contextClass; |
| 160 | if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(DC)) |
| 161 | contextClass = MD->getParent()->getCanonicalDecl(); |
| 162 | else |
| 163 | contextClass = cast<CXXRecordDecl>(DC); |
| 164 | |
| 165 | // [class.mfct.non-static]p3: |
| 166 | // ...is used in the body of a non-static member function of class X, |
| 167 | // if name lookup (3.4.1) resolves the name in the id-expression to a |
| 168 | // non-static non-type member of some class C [...] |
| 169 | // ...if C is not X or a base class of X, the class member access expression |
| 170 | // is ill-formed. |
| 171 | if (R.getNamingClass() && |
| 172 | contextClass != R.getNamingClass()->getCanonicalDecl() && |
| 173 | contextClass->isProvablyNotDerivedFrom(R.getNamingClass())) |
| 174 | return (hasNonInstance ? IMA_Mixed_Unrelated : IMA_Error_Unrelated); |
| 175 | |
| 176 | // If we can prove that the current context is unrelated to all the |
| 177 | // declaring classes, it can't be an implicit member reference (in |
| 178 | // which case it's an error if any of those members are selected). |
| 179 | if (IsProvablyNotDerivedFrom(SemaRef, contextClass, Classes)) |
| 180 | return (hasNonInstance ? IMA_Mixed_Unrelated : IMA_Error_Unrelated); |
| 181 | |
| 182 | return (hasNonInstance ? IMA_Mixed : IMA_Instance); |
| 183 | } |
| 184 | |
| 185 | /// Diagnose a reference to a field with no object available. |
| 186 | static void DiagnoseInstanceReference(Sema &SemaRef, |
| 187 | const CXXScopeSpec &SS, |
| 188 | NamedDecl *rep, |
| 189 | const DeclarationNameInfo &nameInfo) { |
| 190 | SourceLocation Loc = nameInfo.getLoc(); |
| 191 | SourceRange Range(Loc); |
| 192 | if (SS.isSet()) Range.setBegin(SS.getRange().getBegin()); |
| 193 | |
| 194 | if (isa<FieldDecl>(rep) || isa<IndirectFieldDecl>(rep)) { |
| 195 | if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(SemaRef.CurContext)) { |
| 196 | if (MD->isStatic()) { |
| 197 | // "invalid use of member 'x' in static member function" |
| 198 | SemaRef.Diag(Loc, diag::err_invalid_member_use_in_static_method) |
| 199 | << Range << nameInfo.getName(); |
| 200 | return; |
| 201 | } |
| 202 | } |
| 203 | |
| 204 | SemaRef.Diag(Loc, diag::err_invalid_non_static_member_use) |
| 205 | << nameInfo.getName() << Range; |
| 206 | return; |
| 207 | } |
| 208 | |
| 209 | SemaRef.Diag(Loc, diag::err_member_call_without_object) << Range; |
| 210 | } |
| 211 | |
| 212 | /// Builds an expression which might be an implicit member expression. |
| 213 | ExprResult |
| 214 | Sema::BuildPossibleImplicitMemberExpr(const CXXScopeSpec &SS, |
| 215 | LookupResult &R, |
| 216 | const TemplateArgumentListInfo *TemplateArgs) { |
| 217 | switch (ClassifyImplicitMemberAccess(*this, CurScope, R)) { |
| 218 | case IMA_Instance: |
| 219 | return BuildImplicitMemberExpr(SS, R, TemplateArgs, true); |
| 220 | |
| 221 | case IMA_Mixed: |
| 222 | case IMA_Mixed_Unrelated: |
| 223 | case IMA_Unresolved: |
| 224 | return BuildImplicitMemberExpr(SS, R, TemplateArgs, false); |
| 225 | |
| 226 | case IMA_Static: |
| 227 | case IMA_Mixed_StaticContext: |
| 228 | case IMA_Unresolved_StaticContext: |
| 229 | if (TemplateArgs) |
| 230 | return BuildTemplateIdExpr(SS, R, false, *TemplateArgs); |
| 231 | return BuildDeclarationNameExpr(SS, R, false); |
| 232 | |
| 233 | case IMA_Error_StaticContext: |
| 234 | case IMA_Error_Unrelated: |
| 235 | DiagnoseInstanceReference(*this, SS, R.getRepresentativeDecl(), |
| 236 | R.getLookupNameInfo()); |
| 237 | return ExprError(); |
| 238 | } |
| 239 | |
| 240 | llvm_unreachable("unexpected instance member access kind"); |
| 241 | return ExprError(); |
| 242 | } |
| 243 | |
| 244 | /// Check an ext-vector component access expression. |
| 245 | /// |
| 246 | /// VK should be set in advance to the value kind of the base |
| 247 | /// expression. |
| 248 | static QualType |
| 249 | CheckExtVectorComponent(Sema &S, QualType baseType, ExprValueKind &VK, |
| 250 | SourceLocation OpLoc, const IdentifierInfo *CompName, |
| 251 | SourceLocation CompLoc) { |
| 252 | // FIXME: Share logic with ExtVectorElementExpr::containsDuplicateElements, |
| 253 | // see FIXME there. |
| 254 | // |
| 255 | // FIXME: This logic can be greatly simplified by splitting it along |
| 256 | // halving/not halving and reworking the component checking. |
| 257 | const ExtVectorType *vecType = baseType->getAs<ExtVectorType>(); |
| 258 | |
| 259 | // The vector accessor can't exceed the number of elements. |
| 260 | const char *compStr = CompName->getNameStart(); |
| 261 | |
| 262 | // This flag determines whether or not the component is one of the four |
| 263 | // special names that indicate a subset of exactly half the elements are |
| 264 | // to be selected. |
| 265 | bool HalvingSwizzle = false; |
| 266 | |
| 267 | // This flag determines whether or not CompName has an 's' char prefix, |
| 268 | // indicating that it is a string of hex values to be used as vector indices. |
| 269 | bool HexSwizzle = *compStr == 's' || *compStr == 'S'; |
| 270 | |
| 271 | bool HasRepeated = false; |
| 272 | bool HasIndex[16] = {}; |
| 273 | |
| 274 | int Idx; |
| 275 | |
| 276 | // Check that we've found one of the special components, or that the component |
| 277 | // names must come from the same set. |
| 278 | if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") || |
| 279 | !strcmp(compStr, "even") || !strcmp(compStr, "odd")) { |
| 280 | HalvingSwizzle = true; |
| 281 | } else if (!HexSwizzle && |
| 282 | (Idx = vecType->getPointAccessorIdx(*compStr)) != -1) { |
| 283 | do { |
| 284 | if (HasIndex[Idx]) HasRepeated = true; |
| 285 | HasIndex[Idx] = true; |
| 286 | compStr++; |
| 287 | } while (*compStr && (Idx = vecType->getPointAccessorIdx(*compStr)) != -1); |
| 288 | } else { |
| 289 | if (HexSwizzle) compStr++; |
| 290 | while ((Idx = vecType->getNumericAccessorIdx(*compStr)) != -1) { |
| 291 | if (HasIndex[Idx]) HasRepeated = true; |
| 292 | HasIndex[Idx] = true; |
| 293 | compStr++; |
| 294 | } |
| 295 | } |
| 296 | |
| 297 | if (!HalvingSwizzle && *compStr) { |
| 298 | // We didn't get to the end of the string. This means the component names |
| 299 | // didn't come from the same set *or* we encountered an illegal name. |
| 300 | S.Diag(OpLoc, diag::err_ext_vector_component_name_illegal) |
| 301 | << llvm::StringRef(compStr, 1) << SourceRange(CompLoc); |
| 302 | return QualType(); |
| 303 | } |
| 304 | |
| 305 | // Ensure no component accessor exceeds the width of the vector type it |
| 306 | // operates on. |
| 307 | if (!HalvingSwizzle) { |
| 308 | compStr = CompName->getNameStart(); |
| 309 | |
| 310 | if (HexSwizzle) |
| 311 | compStr++; |
| 312 | |
| 313 | while (*compStr) { |
| 314 | if (!vecType->isAccessorWithinNumElements(*compStr++)) { |
| 315 | S.Diag(OpLoc, diag::err_ext_vector_component_exceeds_length) |
| 316 | << baseType << SourceRange(CompLoc); |
| 317 | return QualType(); |
| 318 | } |
| 319 | } |
| 320 | } |
| 321 | |
| 322 | // The component accessor looks fine - now we need to compute the actual type. |
| 323 | // The vector type is implied by the component accessor. For example, |
| 324 | // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc. |
| 325 | // vec4.s0 is a float, vec4.s23 is a vec3, etc. |
| 326 | // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2. |
| 327 | unsigned CompSize = HalvingSwizzle ? (vecType->getNumElements() + 1) / 2 |
| 328 | : CompName->getLength(); |
| 329 | if (HexSwizzle) |
| 330 | CompSize--; |
| 331 | |
| 332 | if (CompSize == 1) |
| 333 | return vecType->getElementType(); |
| 334 | |
| 335 | if (HasRepeated) VK = VK_RValue; |
| 336 | |
| 337 | QualType VT = S.Context.getExtVectorType(vecType->getElementType(), CompSize); |
| 338 | // Now look up the TypeDefDecl from the vector type. Without this, |
| 339 | // diagostics look bad. We want extended vector types to appear built-in. |
| 340 | for (unsigned i = 0, E = S.ExtVectorDecls.size(); i != E; ++i) { |
| 341 | if (S.ExtVectorDecls[i]->getUnderlyingType() == VT) |
| 342 | return S.Context.getTypedefType(S.ExtVectorDecls[i]); |
| 343 | } |
| 344 | return VT; // should never get here (a typedef type should always be found). |
| 345 | } |
| 346 | |
| 347 | static Decl *FindGetterSetterNameDeclFromProtocolList(const ObjCProtocolDecl*PDecl, |
| 348 | IdentifierInfo *Member, |
| 349 | const Selector &Sel, |
| 350 | ASTContext &Context) { |
| 351 | if (Member) |
| 352 | if (ObjCPropertyDecl *PD = PDecl->FindPropertyDeclaration(Member)) |
| 353 | return PD; |
| 354 | if (ObjCMethodDecl *OMD = PDecl->getInstanceMethod(Sel)) |
| 355 | return OMD; |
| 356 | |
| 357 | for (ObjCProtocolDecl::protocol_iterator I = PDecl->protocol_begin(), |
| 358 | E = PDecl->protocol_end(); I != E; ++I) { |
| 359 | if (Decl *D = FindGetterSetterNameDeclFromProtocolList(*I, Member, Sel, |
| 360 | Context)) |
| 361 | return D; |
| 362 | } |
| 363 | return 0; |
| 364 | } |
| 365 | |
| 366 | static Decl *FindGetterSetterNameDecl(const ObjCObjectPointerType *QIdTy, |
| 367 | IdentifierInfo *Member, |
| 368 | const Selector &Sel, |
| 369 | ASTContext &Context) { |
| 370 | // Check protocols on qualified interfaces. |
| 371 | Decl *GDecl = 0; |
| 372 | for (ObjCObjectPointerType::qual_iterator I = QIdTy->qual_begin(), |
| 373 | E = QIdTy->qual_end(); I != E; ++I) { |
| 374 | if (Member) |
| 375 | if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Member)) { |
| 376 | GDecl = PD; |
| 377 | break; |
| 378 | } |
| 379 | // Also must look for a getter or setter name which uses property syntax. |
| 380 | if (ObjCMethodDecl *OMD = (*I)->getInstanceMethod(Sel)) { |
| 381 | GDecl = OMD; |
| 382 | break; |
| 383 | } |
| 384 | } |
| 385 | if (!GDecl) { |
| 386 | for (ObjCObjectPointerType::qual_iterator I = QIdTy->qual_begin(), |
| 387 | E = QIdTy->qual_end(); I != E; ++I) { |
| 388 | // Search in the protocol-qualifier list of current protocol. |
| 389 | GDecl = FindGetterSetterNameDeclFromProtocolList(*I, Member, Sel, |
| 390 | Context); |
| 391 | if (GDecl) |
| 392 | return GDecl; |
| 393 | } |
| 394 | } |
| 395 | return GDecl; |
| 396 | } |
| 397 | |
| 398 | ExprResult |
| 399 | Sema::ActOnDependentMemberExpr(Expr *BaseExpr, QualType BaseType, |
| 400 | bool IsArrow, SourceLocation OpLoc, |
| 401 | const CXXScopeSpec &SS, |
| 402 | NamedDecl *FirstQualifierInScope, |
| 403 | const DeclarationNameInfo &NameInfo, |
| 404 | const TemplateArgumentListInfo *TemplateArgs) { |
| 405 | // Even in dependent contexts, try to diagnose base expressions with |
| 406 | // obviously wrong types, e.g.: |
| 407 | // |
| 408 | // T* t; |
| 409 | // t.f; |
| 410 | // |
| 411 | // In Obj-C++, however, the above expression is valid, since it could be |
| 412 | // accessing the 'f' property if T is an Obj-C interface. The extra check |
| 413 | // allows this, while still reporting an error if T is a struct pointer. |
| 414 | if (!IsArrow) { |
| 415 | const PointerType *PT = BaseType->getAs<PointerType>(); |
| 416 | if (PT && (!getLangOptions().ObjC1 || |
| 417 | PT->getPointeeType()->isRecordType())) { |
| 418 | assert(BaseExpr && "cannot happen with implicit member accesses"); |
| 419 | Diag(NameInfo.getLoc(), diag::err_typecheck_member_reference_struct_union) |
| 420 | << BaseType << BaseExpr->getSourceRange(); |
| 421 | return ExprError(); |
| 422 | } |
| 423 | } |
| 424 | |
| 425 | assert(BaseType->isDependentType() || |
| 426 | NameInfo.getName().isDependentName() || |
| 427 | isDependentScopeSpecifier(SS)); |
| 428 | |
| 429 | // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr |
| 430 | // must have pointer type, and the accessed type is the pointee. |
| 431 | return Owned(CXXDependentScopeMemberExpr::Create(Context, BaseExpr, BaseType, |
| 432 | IsArrow, OpLoc, |
| 433 | SS.getWithLocInContext(Context), |
| 434 | FirstQualifierInScope, |
| 435 | NameInfo, TemplateArgs)); |
| 436 | } |
| 437 | |
| 438 | /// We know that the given qualified member reference points only to |
| 439 | /// declarations which do not belong to the static type of the base |
| 440 | /// expression. Diagnose the problem. |
| 441 | static void DiagnoseQualifiedMemberReference(Sema &SemaRef, |
| 442 | Expr *BaseExpr, |
| 443 | QualType BaseType, |
| 444 | const CXXScopeSpec &SS, |
| 445 | NamedDecl *rep, |
| 446 | const DeclarationNameInfo &nameInfo) { |
| 447 | // If this is an implicit member access, use a different set of |
| 448 | // diagnostics. |
| 449 | if (!BaseExpr) |
| 450 | return DiagnoseInstanceReference(SemaRef, SS, rep, nameInfo); |
| 451 | |
| 452 | SemaRef.Diag(nameInfo.getLoc(), diag::err_qualified_member_of_unrelated) |
| 453 | << SS.getRange() << rep << BaseType; |
| 454 | } |
| 455 | |
| 456 | // Check whether the declarations we found through a nested-name |
| 457 | // specifier in a member expression are actually members of the base |
| 458 | // type. The restriction here is: |
| 459 | // |
| 460 | // C++ [expr.ref]p2: |
| 461 | // ... In these cases, the id-expression shall name a |
| 462 | // member of the class or of one of its base classes. |
| 463 | // |
| 464 | // So it's perfectly legitimate for the nested-name specifier to name |
| 465 | // an unrelated class, and for us to find an overload set including |
| 466 | // decls from classes which are not superclasses, as long as the decl |
| 467 | // we actually pick through overload resolution is from a superclass. |
| 468 | bool Sema::CheckQualifiedMemberReference(Expr *BaseExpr, |
| 469 | QualType BaseType, |
| 470 | const CXXScopeSpec &SS, |
| 471 | const LookupResult &R) { |
| 472 | const RecordType *BaseRT = BaseType->getAs<RecordType>(); |
| 473 | if (!BaseRT) { |
| 474 | // We can't check this yet because the base type is still |
| 475 | // dependent. |
| 476 | assert(BaseType->isDependentType()); |
| 477 | return false; |
| 478 | } |
| 479 | CXXRecordDecl *BaseRecord = cast<CXXRecordDecl>(BaseRT->getDecl()); |
| 480 | |
| 481 | for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { |
| 482 | // If this is an implicit member reference and we find a |
| 483 | // non-instance member, it's not an error. |
| 484 | if (!BaseExpr && !(*I)->isCXXInstanceMember()) |
| 485 | return false; |
| 486 | |
| 487 | // Note that we use the DC of the decl, not the underlying decl. |
| 488 | DeclContext *DC = (*I)->getDeclContext(); |
| 489 | while (DC->isTransparentContext()) |
| 490 | DC = DC->getParent(); |
| 491 | |
| 492 | if (!DC->isRecord()) |
| 493 | continue; |
| 494 | |
| 495 | llvm::SmallPtrSet<CXXRecordDecl*,4> MemberRecord; |
| 496 | MemberRecord.insert(cast<CXXRecordDecl>(DC)->getCanonicalDecl()); |
| 497 | |
| 498 | if (!IsProvablyNotDerivedFrom(*this, BaseRecord, MemberRecord)) |
| 499 | return false; |
| 500 | } |
| 501 | |
| 502 | DiagnoseQualifiedMemberReference(*this, BaseExpr, BaseType, SS, |
| 503 | R.getRepresentativeDecl(), |
| 504 | R.getLookupNameInfo()); |
| 505 | return true; |
| 506 | } |
| 507 | |
| 508 | static bool |
| 509 | LookupMemberExprInRecord(Sema &SemaRef, LookupResult &R, |
| 510 | SourceRange BaseRange, const RecordType *RTy, |
| 511 | SourceLocation OpLoc, CXXScopeSpec &SS, |
| 512 | bool HasTemplateArgs) { |
| 513 | RecordDecl *RDecl = RTy->getDecl(); |
| 514 | if (SemaRef.RequireCompleteType(OpLoc, QualType(RTy, 0), |
| 515 | SemaRef.PDiag(diag::err_typecheck_incomplete_tag) |
| 516 | << BaseRange)) |
| 517 | return true; |
| 518 | |
| 519 | if (HasTemplateArgs) { |
| 520 | // LookupTemplateName doesn't expect these both to exist simultaneously. |
| 521 | QualType ObjectType = SS.isSet() ? QualType() : QualType(RTy, 0); |
| 522 | |
| 523 | bool MOUS; |
| 524 | SemaRef.LookupTemplateName(R, 0, SS, ObjectType, false, MOUS); |
| 525 | return false; |
| 526 | } |
| 527 | |
| 528 | DeclContext *DC = RDecl; |
| 529 | if (SS.isSet()) { |
| 530 | // If the member name was a qualified-id, look into the |
| 531 | // nested-name-specifier. |
| 532 | DC = SemaRef.computeDeclContext(SS, false); |
| 533 | |
| 534 | if (SemaRef.RequireCompleteDeclContext(SS, DC)) { |
| 535 | SemaRef.Diag(SS.getRange().getEnd(), diag::err_typecheck_incomplete_tag) |
| 536 | << SS.getRange() << DC; |
| 537 | return true; |
| 538 | } |
| 539 | |
| 540 | assert(DC && "Cannot handle non-computable dependent contexts in lookup"); |
| 541 | |
| 542 | if (!isa<TypeDecl>(DC)) { |
| 543 | SemaRef.Diag(R.getNameLoc(), diag::err_qualified_member_nonclass) |
| 544 | << DC << SS.getRange(); |
| 545 | return true; |
| 546 | } |
| 547 | } |
| 548 | |
| 549 | // The record definition is complete, now look up the member. |
| 550 | SemaRef.LookupQualifiedName(R, DC); |
| 551 | |
| 552 | if (!R.empty()) |
| 553 | return false; |
| 554 | |
| 555 | // We didn't find anything with the given name, so try to correct |
| 556 | // for typos. |
| 557 | DeclarationName Name = R.getLookupName(); |
| 558 | if (SemaRef.CorrectTypo(R, 0, &SS, DC, false, Sema::CTC_MemberLookup) && |
| 559 | !R.empty() && |
| 560 | (isa<ValueDecl>(*R.begin()) || isa<FunctionTemplateDecl>(*R.begin()))) { |
| 561 | SemaRef.Diag(R.getNameLoc(), diag::err_no_member_suggest) |
| 562 | << Name << DC << R.getLookupName() << SS.getRange() |
| 563 | << FixItHint::CreateReplacement(R.getNameLoc(), |
| 564 | R.getLookupName().getAsString()); |
| 565 | if (NamedDecl *ND = R.getAsSingle<NamedDecl>()) |
| 566 | SemaRef.Diag(ND->getLocation(), diag::note_previous_decl) |
| 567 | << ND->getDeclName(); |
| 568 | return false; |
| 569 | } else { |
| 570 | R.clear(); |
| 571 | R.setLookupName(Name); |
| 572 | } |
| 573 | |
| 574 | return false; |
| 575 | } |
| 576 | |
| 577 | ExprResult |
| 578 | Sema::BuildMemberReferenceExpr(Expr *Base, QualType BaseType, |
| 579 | SourceLocation OpLoc, bool IsArrow, |
| 580 | CXXScopeSpec &SS, |
| 581 | NamedDecl *FirstQualifierInScope, |
| 582 | const DeclarationNameInfo &NameInfo, |
| 583 | const TemplateArgumentListInfo *TemplateArgs) { |
| 584 | if (BaseType->isDependentType() || |
| 585 | (SS.isSet() && isDependentScopeSpecifier(SS))) |
| 586 | return ActOnDependentMemberExpr(Base, BaseType, |
| 587 | IsArrow, OpLoc, |
| 588 | SS, FirstQualifierInScope, |
| 589 | NameInfo, TemplateArgs); |
| 590 | |
| 591 | LookupResult R(*this, NameInfo, LookupMemberName); |
| 592 | |
| 593 | // Implicit member accesses. |
| 594 | if (!Base) { |
| 595 | QualType RecordTy = BaseType; |
| 596 | if (IsArrow) RecordTy = RecordTy->getAs<PointerType>()->getPointeeType(); |
| 597 | if (LookupMemberExprInRecord(*this, R, SourceRange(), |
| 598 | RecordTy->getAs<RecordType>(), |
| 599 | OpLoc, SS, TemplateArgs != 0)) |
| 600 | return ExprError(); |
| 601 | |
| 602 | // Explicit member accesses. |
| 603 | } else { |
| 604 | ExprResult BaseResult = Owned(Base); |
| 605 | ExprResult Result = |
| 606 | LookupMemberExpr(R, BaseResult, IsArrow, OpLoc, |
| 607 | SS, /*ObjCImpDecl*/ 0, TemplateArgs != 0); |
| 608 | |
| 609 | if (BaseResult.isInvalid()) |
| 610 | return ExprError(); |
| 611 | Base = BaseResult.take(); |
| 612 | |
| 613 | if (Result.isInvalid()) { |
| 614 | Owned(Base); |
| 615 | return ExprError(); |
| 616 | } |
| 617 | |
| 618 | if (Result.get()) |
| 619 | return move(Result); |
| 620 | |
| 621 | // LookupMemberExpr can modify Base, and thus change BaseType |
| 622 | BaseType = Base->getType(); |
| 623 | } |
| 624 | |
| 625 | return BuildMemberReferenceExpr(Base, BaseType, |
| 626 | OpLoc, IsArrow, SS, FirstQualifierInScope, |
| 627 | R, TemplateArgs); |
| 628 | } |
| 629 | |
| 630 | static ExprResult |
| 631 | BuildFieldReferenceExpr(Sema &S, Expr *BaseExpr, bool IsArrow, |
| 632 | const CXXScopeSpec &SS, FieldDecl *Field, |
| 633 | DeclAccessPair FoundDecl, |
| 634 | const DeclarationNameInfo &MemberNameInfo); |
| 635 | |
| 636 | ExprResult |
| 637 | Sema::BuildAnonymousStructUnionMemberReference(const CXXScopeSpec &SS, |
| 638 | SourceLocation loc, |
| 639 | IndirectFieldDecl *indirectField, |
| 640 | Expr *baseObjectExpr, |
| 641 | SourceLocation opLoc) { |
| 642 | // First, build the expression that refers to the base object. |
| 643 | |
| 644 | bool baseObjectIsPointer = false; |
| 645 | Qualifiers baseQuals; |
| 646 | |
| 647 | // Case 1: the base of the indirect field is not a field. |
| 648 | VarDecl *baseVariable = indirectField->getVarDecl(); |
| 649 | CXXScopeSpec EmptySS; |
| 650 | if (baseVariable) { |
| 651 | assert(baseVariable->getType()->isRecordType()); |
| 652 | |
| 653 | // In principle we could have a member access expression that |
| 654 | // accesses an anonymous struct/union that's a static member of |
| 655 | // the base object's class. However, under the current standard, |
| 656 | // static data members cannot be anonymous structs or unions. |
| 657 | // Supporting this is as easy as building a MemberExpr here. |
| 658 | assert(!baseObjectExpr && "anonymous struct/union is static data member?"); |
| 659 | |
| 660 | DeclarationNameInfo baseNameInfo(DeclarationName(), loc); |
| 661 | |
| 662 | ExprResult result |
| 663 | = BuildDeclarationNameExpr(EmptySS, baseNameInfo, baseVariable); |
| 664 | if (result.isInvalid()) return ExprError(); |
| 665 | |
| 666 | baseObjectExpr = result.take(); |
| 667 | baseObjectIsPointer = false; |
| 668 | baseQuals = baseObjectExpr->getType().getQualifiers(); |
| 669 | |
| 670 | // Case 2: the base of the indirect field is a field and the user |
| 671 | // wrote a member expression. |
| 672 | } else if (baseObjectExpr) { |
| 673 | // The caller provided the base object expression. Determine |
| 674 | // whether its a pointer and whether it adds any qualifiers to the |
| 675 | // anonymous struct/union fields we're looking into. |
| 676 | QualType objectType = baseObjectExpr->getType(); |
| 677 | |
| 678 | if (const PointerType *ptr = objectType->getAs<PointerType>()) { |
| 679 | baseObjectIsPointer = true; |
| 680 | objectType = ptr->getPointeeType(); |
| 681 | } else { |
| 682 | baseObjectIsPointer = false; |
| 683 | } |
| 684 | baseQuals = objectType.getQualifiers(); |
| 685 | |
| 686 | // Case 3: the base of the indirect field is a field and we should |
| 687 | // build an implicit member access. |
| 688 | } else { |
| 689 | // We've found a member of an anonymous struct/union that is |
| 690 | // inside a non-anonymous struct/union, so in a well-formed |
| 691 | // program our base object expression is "this". |
| 692 | QualType ThisTy = getAndCaptureCurrentThisType(); |
| 693 | if (ThisTy.isNull()) { |
| 694 | Diag(loc, diag::err_invalid_member_use_in_static_method) |
| 695 | << indirectField->getDeclName(); |
| 696 | return ExprError(); |
| 697 | } |
| 698 | |
| 699 | // Our base object expression is "this". |
| 700 | baseObjectExpr |
| 701 | = new (Context) CXXThisExpr(loc, ThisTy, /*isImplicit=*/ true); |
| 702 | baseObjectIsPointer = true; |
| 703 | baseQuals = ThisTy->castAs<PointerType>()->getPointeeType().getQualifiers(); |
| 704 | } |
| 705 | |
| 706 | // Build the implicit member references to the field of the |
| 707 | // anonymous struct/union. |
| 708 | Expr *result = baseObjectExpr; |
| 709 | IndirectFieldDecl::chain_iterator |
| 710 | FI = indirectField->chain_begin(), FEnd = indirectField->chain_end(); |
| 711 | |
| 712 | // Build the first member access in the chain with full information. |
| 713 | if (!baseVariable) { |
| 714 | FieldDecl *field = cast<FieldDecl>(*FI); |
| 715 | |
| 716 | // FIXME: use the real found-decl info! |
| 717 | DeclAccessPair foundDecl = DeclAccessPair::make(field, field->getAccess()); |
| 718 | |
| 719 | // Make a nameInfo that properly uses the anonymous name. |
| 720 | DeclarationNameInfo memberNameInfo(field->getDeclName(), loc); |
| 721 | |
| 722 | result = BuildFieldReferenceExpr(*this, result, baseObjectIsPointer, |
| 723 | EmptySS, field, foundDecl, |
| 724 | memberNameInfo).take(); |
| 725 | baseObjectIsPointer = false; |
| 726 | |
| 727 | // FIXME: check qualified member access |
| 728 | } |
| 729 | |
| 730 | // In all cases, we should now skip the first declaration in the chain. |
| 731 | ++FI; |
| 732 | |
| 733 | while (FI != FEnd) { |
| 734 | FieldDecl *field = cast<FieldDecl>(*FI++); |
| 735 | |
| 736 | // FIXME: these are somewhat meaningless |
| 737 | DeclarationNameInfo memberNameInfo(field->getDeclName(), loc); |
| 738 | DeclAccessPair foundDecl = DeclAccessPair::make(field, field->getAccess()); |
| 739 | |
| 740 | result = BuildFieldReferenceExpr(*this, result, /*isarrow*/ false, |
| 741 | (FI == FEnd? SS : EmptySS), field, |
| 742 | foundDecl, memberNameInfo).take(); |
| 743 | } |
| 744 | |
| 745 | return Owned(result); |
| 746 | } |
| 747 | |
| 748 | /// \brief Build a MemberExpr AST node. |
| 749 | static MemberExpr *BuildMemberExpr(ASTContext &C, Expr *Base, bool isArrow, |
| 750 | const CXXScopeSpec &SS, ValueDecl *Member, |
| 751 | DeclAccessPair FoundDecl, |
| 752 | const DeclarationNameInfo &MemberNameInfo, |
| 753 | QualType Ty, |
| 754 | ExprValueKind VK, ExprObjectKind OK, |
| 755 | const TemplateArgumentListInfo *TemplateArgs = 0) { |
| 756 | return MemberExpr::Create(C, Base, isArrow, SS.getWithLocInContext(C), |
| 757 | Member, FoundDecl, MemberNameInfo, |
| 758 | TemplateArgs, Ty, VK, OK); |
| 759 | } |
| 760 | |
| 761 | ExprResult |
| 762 | Sema::BuildMemberReferenceExpr(Expr *BaseExpr, QualType BaseExprType, |
| 763 | SourceLocation OpLoc, bool IsArrow, |
| 764 | const CXXScopeSpec &SS, |
| 765 | NamedDecl *FirstQualifierInScope, |
| 766 | LookupResult &R, |
| 767 | const TemplateArgumentListInfo *TemplateArgs, |
| 768 | bool SuppressQualifierCheck) { |
| 769 | QualType BaseType = BaseExprType; |
| 770 | if (IsArrow) { |
| 771 | assert(BaseType->isPointerType()); |
| 772 | BaseType = BaseType->getAs<PointerType>()->getPointeeType(); |
| 773 | } |
| 774 | R.setBaseObjectType(BaseType); |
| 775 | |
| 776 | const DeclarationNameInfo &MemberNameInfo = R.getLookupNameInfo(); |
| 777 | DeclarationName MemberName = MemberNameInfo.getName(); |
| 778 | SourceLocation MemberLoc = MemberNameInfo.getLoc(); |
| 779 | |
| 780 | if (R.isAmbiguous()) |
| 781 | return ExprError(); |
| 782 | |
| 783 | if (R.empty()) { |
| 784 | // Rederive where we looked up. |
| 785 | DeclContext *DC = (SS.isSet() |
| 786 | ? computeDeclContext(SS, false) |
| 787 | : BaseType->getAs<RecordType>()->getDecl()); |
| 788 | |
| 789 | Diag(R.getNameLoc(), diag::err_no_member) |
| 790 | << MemberName << DC |
| 791 | << (BaseExpr ? BaseExpr->getSourceRange() : SourceRange()); |
| 792 | return ExprError(); |
| 793 | } |
| 794 | |
| 795 | // Diagnose lookups that find only declarations from a non-base |
| 796 | // type. This is possible for either qualified lookups (which may |
| 797 | // have been qualified with an unrelated type) or implicit member |
| 798 | // expressions (which were found with unqualified lookup and thus |
| 799 | // may have come from an enclosing scope). Note that it's okay for |
| 800 | // lookup to find declarations from a non-base type as long as those |
| 801 | // aren't the ones picked by overload resolution. |
| 802 | if ((SS.isSet() || !BaseExpr || |
| 803 | (isa<CXXThisExpr>(BaseExpr) && |
| 804 | cast<CXXThisExpr>(BaseExpr)->isImplicit())) && |
| 805 | !SuppressQualifierCheck && |
| 806 | CheckQualifiedMemberReference(BaseExpr, BaseType, SS, R)) |
| 807 | return ExprError(); |
| 808 | |
| 809 | // Construct an unresolved result if we in fact got an unresolved |
| 810 | // result. |
| 811 | if (R.isOverloadedResult() || R.isUnresolvableResult()) { |
| 812 | // Suppress any lookup-related diagnostics; we'll do these when we |
| 813 | // pick a member. |
| 814 | R.suppressDiagnostics(); |
| 815 | |
| 816 | UnresolvedMemberExpr *MemExpr |
| 817 | = UnresolvedMemberExpr::Create(Context, R.isUnresolvableResult(), |
| 818 | BaseExpr, BaseExprType, |
| 819 | IsArrow, OpLoc, |
| 820 | SS.getWithLocInContext(Context), |
| 821 | MemberNameInfo, |
| 822 | TemplateArgs, R.begin(), R.end()); |
| 823 | |
| 824 | return Owned(MemExpr); |
| 825 | } |
| 826 | |
| 827 | assert(R.isSingleResult()); |
| 828 | DeclAccessPair FoundDecl = R.begin().getPair(); |
| 829 | NamedDecl *MemberDecl = R.getFoundDecl(); |
| 830 | |
| 831 | // FIXME: diagnose the presence of template arguments now. |
| 832 | |
| 833 | // If the decl being referenced had an error, return an error for this |
| 834 | // sub-expr without emitting another error, in order to avoid cascading |
| 835 | // error cases. |
| 836 | if (MemberDecl->isInvalidDecl()) |
| 837 | return ExprError(); |
| 838 | |
| 839 | // Handle the implicit-member-access case. |
| 840 | if (!BaseExpr) { |
| 841 | // If this is not an instance member, convert to a non-member access. |
| 842 | if (!MemberDecl->isCXXInstanceMember()) |
| 843 | return BuildDeclarationNameExpr(SS, R.getLookupNameInfo(), MemberDecl); |
| 844 | |
| 845 | SourceLocation Loc = R.getNameLoc(); |
| 846 | if (SS.getRange().isValid()) |
| 847 | Loc = SS.getRange().getBegin(); |
| 848 | BaseExpr = new (Context) CXXThisExpr(Loc, BaseExprType,/*isImplicit=*/true); |
| 849 | } |
| 850 | |
| 851 | bool ShouldCheckUse = true; |
| 852 | if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(MemberDecl)) { |
| 853 | // Don't diagnose the use of a virtual member function unless it's |
| 854 | // explicitly qualified. |
| 855 | if (MD->isVirtual() && !SS.isSet()) |
| 856 | ShouldCheckUse = false; |
| 857 | } |
| 858 | |
| 859 | // Check the use of this member. |
| 860 | if (ShouldCheckUse && DiagnoseUseOfDecl(MemberDecl, MemberLoc)) { |
| 861 | Owned(BaseExpr); |
| 862 | return ExprError(); |
| 863 | } |
| 864 | |
| 865 | // Perform a property load on the base regardless of whether we |
| 866 | // actually need it for the declaration. |
| 867 | if (BaseExpr->getObjectKind() == OK_ObjCProperty) { |
| 868 | ExprResult Result = ConvertPropertyForRValue(BaseExpr); |
| 869 | if (Result.isInvalid()) |
| 870 | return ExprError(); |
| 871 | BaseExpr = Result.take(); |
| 872 | } |
| 873 | |
| 874 | if (FieldDecl *FD = dyn_cast<FieldDecl>(MemberDecl)) |
| 875 | return BuildFieldReferenceExpr(*this, BaseExpr, IsArrow, |
| 876 | SS, FD, FoundDecl, MemberNameInfo); |
| 877 | |
| 878 | if (IndirectFieldDecl *FD = dyn_cast<IndirectFieldDecl>(MemberDecl)) |
| 879 | // We may have found a field within an anonymous union or struct |
| 880 | // (C++ [class.union]). |
| 881 | return BuildAnonymousStructUnionMemberReference(SS, MemberLoc, FD, |
| 882 | BaseExpr, OpLoc); |
| 883 | |
| 884 | if (VarDecl *Var = dyn_cast<VarDecl>(MemberDecl)) { |
| 885 | MarkDeclarationReferenced(MemberLoc, Var); |
| 886 | return Owned(BuildMemberExpr(Context, BaseExpr, IsArrow, SS, |
| 887 | Var, FoundDecl, MemberNameInfo, |
| 888 | Var->getType().getNonReferenceType(), |
| 889 | VK_LValue, OK_Ordinary)); |
| 890 | } |
| 891 | |
| 892 | if (CXXMethodDecl *MemberFn = dyn_cast<CXXMethodDecl>(MemberDecl)) { |
| 893 | ExprValueKind valueKind; |
| 894 | QualType type; |
| 895 | if (MemberFn->isInstance()) { |
| 896 | valueKind = VK_RValue; |
| 897 | type = Context.BoundMemberTy; |
| 898 | } else { |
| 899 | valueKind = VK_LValue; |
| 900 | type = MemberFn->getType(); |
| 901 | } |
| 902 | |
| 903 | MarkDeclarationReferenced(MemberLoc, MemberDecl); |
| 904 | return Owned(BuildMemberExpr(Context, BaseExpr, IsArrow, SS, |
| 905 | MemberFn, FoundDecl, MemberNameInfo, |
| 906 | type, valueKind, OK_Ordinary)); |
| 907 | } |
| 908 | assert(!isa<FunctionDecl>(MemberDecl) && "member function not C++ method?"); |
| 909 | |
| 910 | if (EnumConstantDecl *Enum = dyn_cast<EnumConstantDecl>(MemberDecl)) { |
| 911 | MarkDeclarationReferenced(MemberLoc, MemberDecl); |
| 912 | return Owned(BuildMemberExpr(Context, BaseExpr, IsArrow, SS, |
| 913 | Enum, FoundDecl, MemberNameInfo, |
| 914 | Enum->getType(), VK_RValue, OK_Ordinary)); |
| 915 | } |
| 916 | |
| 917 | Owned(BaseExpr); |
| 918 | |
| 919 | // We found something that we didn't expect. Complain. |
| 920 | if (isa<TypeDecl>(MemberDecl)) |
| 921 | Diag(MemberLoc, diag::err_typecheck_member_reference_type) |
| 922 | << MemberName << BaseType << int(IsArrow); |
| 923 | else |
| 924 | Diag(MemberLoc, diag::err_typecheck_member_reference_unknown) |
| 925 | << MemberName << BaseType << int(IsArrow); |
| 926 | |
| 927 | Diag(MemberDecl->getLocation(), diag::note_member_declared_here) |
| 928 | << MemberName; |
| 929 | R.suppressDiagnostics(); |
| 930 | return ExprError(); |
| 931 | } |
| 932 | |
| 933 | /// Given that normal member access failed on the given expression, |
| 934 | /// and given that the expression's type involves builtin-id or |
| 935 | /// builtin-Class, decide whether substituting in the redefinition |
| 936 | /// types would be profitable. The redefinition type is whatever |
| 937 | /// this translation unit tried to typedef to id/Class; we store |
| 938 | /// it to the side and then re-use it in places like this. |
| 939 | static bool ShouldTryAgainWithRedefinitionType(Sema &S, ExprResult &base) { |
| 940 | const ObjCObjectPointerType *opty |
| 941 | = base.get()->getType()->getAs<ObjCObjectPointerType>(); |
| 942 | if (!opty) return false; |
| 943 | |
| 944 | const ObjCObjectType *ty = opty->getObjectType(); |
| 945 | |
| 946 | QualType redef; |
| 947 | if (ty->isObjCId()) { |
| 948 | redef = S.Context.ObjCIdRedefinitionType; |
| 949 | } else if (ty->isObjCClass()) { |
| 950 | redef = S.Context.ObjCClassRedefinitionType; |
| 951 | } else { |
| 952 | return false; |
| 953 | } |
| 954 | |
| 955 | // Do the substitution as long as the redefinition type isn't just a |
| 956 | // possibly-qualified pointer to builtin-id or builtin-Class again. |
| 957 | opty = redef->getAs<ObjCObjectPointerType>(); |
| 958 | if (opty && !opty->getObjectType()->getInterface() != 0) |
| 959 | return false; |
| 960 | |
| 961 | base = S.ImpCastExprToType(base.take(), redef, CK_BitCast); |
| 962 | return true; |
| 963 | } |
| 964 | |
| 965 | /// Look up the given member of the given non-type-dependent |
| 966 | /// expression. This can return in one of two ways: |
| 967 | /// * If it returns a sentinel null-but-valid result, the caller will |
| 968 | /// assume that lookup was performed and the results written into |
| 969 | /// the provided structure. It will take over from there. |
| 970 | /// * Otherwise, the returned expression will be produced in place of |
| 971 | /// an ordinary member expression. |
| 972 | /// |
| 973 | /// The ObjCImpDecl bit is a gross hack that will need to be properly |
| 974 | /// fixed for ObjC++. |
| 975 | ExprResult |
| 976 | Sema::LookupMemberExpr(LookupResult &R, ExprResult &BaseExpr, |
| 977 | bool &IsArrow, SourceLocation OpLoc, |
| 978 | CXXScopeSpec &SS, |
| 979 | Decl *ObjCImpDecl, bool HasTemplateArgs) { |
| 980 | assert(BaseExpr.get() && "no base expression"); |
| 981 | |
| 982 | // Perform default conversions. |
| 983 | BaseExpr = DefaultFunctionArrayConversion(BaseExpr.take()); |
| 984 | |
| 985 | if (IsArrow) { |
| 986 | BaseExpr = DefaultLvalueConversion(BaseExpr.take()); |
| 987 | if (BaseExpr.isInvalid()) |
| 988 | return ExprError(); |
| 989 | } |
| 990 | |
| 991 | QualType BaseType = BaseExpr.get()->getType(); |
| 992 | assert(!BaseType->isDependentType()); |
| 993 | |
| 994 | DeclarationName MemberName = R.getLookupName(); |
| 995 | SourceLocation MemberLoc = R.getNameLoc(); |
| 996 | |
| 997 | // For later type-checking purposes, turn arrow accesses into dot |
| 998 | // accesses. The only access type we support that doesn't follow |
| 999 | // the C equivalence "a->b === (*a).b" is ObjC property accesses, |
| 1000 | // and those never use arrows, so this is unaffected. |
| 1001 | if (IsArrow) { |
| 1002 | if (const PointerType *Ptr = BaseType->getAs<PointerType>()) |
| 1003 | BaseType = Ptr->getPointeeType(); |
| 1004 | else if (const ObjCObjectPointerType *Ptr |
| 1005 | = BaseType->getAs<ObjCObjectPointerType>()) |
| 1006 | BaseType = Ptr->getPointeeType(); |
| 1007 | else if (BaseType->isRecordType()) { |
| 1008 | // Recover from arrow accesses to records, e.g.: |
| 1009 | // struct MyRecord foo; |
| 1010 | // foo->bar |
| 1011 | // This is actually well-formed in C++ if MyRecord has an |
| 1012 | // overloaded operator->, but that should have been dealt with |
| 1013 | // by now. |
| 1014 | Diag(OpLoc, diag::err_typecheck_member_reference_suggestion) |
| 1015 | << BaseType << int(IsArrow) << BaseExpr.get()->getSourceRange() |
| 1016 | << FixItHint::CreateReplacement(OpLoc, "."); |
| 1017 | IsArrow = false; |
| 1018 | } else if (BaseType == Context.BoundMemberTy) { |
| 1019 | goto fail; |
| 1020 | } else { |
| 1021 | Diag(MemberLoc, diag::err_typecheck_member_reference_arrow) |
| 1022 | << BaseType << BaseExpr.get()->getSourceRange(); |
| 1023 | return ExprError(); |
| 1024 | } |
| 1025 | } |
| 1026 | |
| 1027 | // Handle field access to simple records. |
| 1028 | if (const RecordType *RTy = BaseType->getAs<RecordType>()) { |
| 1029 | if (LookupMemberExprInRecord(*this, R, BaseExpr.get()->getSourceRange(), |
| 1030 | RTy, OpLoc, SS, HasTemplateArgs)) |
| 1031 | return ExprError(); |
| 1032 | |
| 1033 | // Returning valid-but-null is how we indicate to the caller that |
| 1034 | // the lookup result was filled in. |
| 1035 | return Owned((Expr*) 0); |
| 1036 | } |
| 1037 | |
| 1038 | // Handle ivar access to Objective-C objects. |
| 1039 | if (const ObjCObjectType *OTy = BaseType->getAs<ObjCObjectType>()) { |
| 1040 | IdentifierInfo *Member = MemberName.getAsIdentifierInfo(); |
| 1041 | |
| 1042 | // There are three cases for the base type: |
| 1043 | // - builtin id (qualified or unqualified) |
| 1044 | // - builtin Class (qualified or unqualified) |
| 1045 | // - an interface |
| 1046 | ObjCInterfaceDecl *IDecl = OTy->getInterface(); |
| 1047 | if (!IDecl) { |
| 1048 | if (getLangOptions().ObjCAutoRefCount && |
| 1049 | (OTy->isObjCId() || OTy->isObjCClass())) |
| 1050 | goto fail; |
| 1051 | // There's an implicit 'isa' ivar on all objects. |
| 1052 | // But we only actually find it this way on objects of type 'id', |
| 1053 | // apparently. |
| 1054 | if (OTy->isObjCId() && Member->isStr("isa")) |
| 1055 | return Owned(new (Context) ObjCIsaExpr(BaseExpr.take(), IsArrow, MemberLoc, |
| 1056 | Context.getObjCClassType())); |
| 1057 | |
| 1058 | if (ShouldTryAgainWithRedefinitionType(*this, BaseExpr)) |
| 1059 | return LookupMemberExpr(R, BaseExpr, IsArrow, OpLoc, SS, |
| 1060 | ObjCImpDecl, HasTemplateArgs); |
| 1061 | goto fail; |
| 1062 | } |
| 1063 | |
| 1064 | ObjCInterfaceDecl *ClassDeclared; |
| 1065 | ObjCIvarDecl *IV = IDecl->lookupInstanceVariable(Member, ClassDeclared); |
| 1066 | |
| 1067 | if (!IV) { |
| 1068 | // Attempt to correct for typos in ivar names. |
| 1069 | LookupResult Res(*this, R.getLookupName(), R.getNameLoc(), |
| 1070 | LookupMemberName); |
| 1071 | if (CorrectTypo(Res, 0, 0, IDecl, false, |
| 1072 | IsArrow ? CTC_ObjCIvarLookup |
| 1073 | : CTC_ObjCPropertyLookup) && |
| 1074 | (IV = Res.getAsSingle<ObjCIvarDecl>())) { |
| 1075 | Diag(R.getNameLoc(), |
| 1076 | diag::err_typecheck_member_reference_ivar_suggest) |
| 1077 | << IDecl->getDeclName() << MemberName << IV->getDeclName() |
| 1078 | << FixItHint::CreateReplacement(R.getNameLoc(), |
| 1079 | IV->getNameAsString()); |
| 1080 | Diag(IV->getLocation(), diag::note_previous_decl) |
| 1081 | << IV->getDeclName(); |
| 1082 | } else { |
Fariborz Jahanian | 6326e05 | 2011-06-28 00:00:52 +0000 | [diff] [blame^] | 1083 | if (IsArrow && IDecl->FindPropertyDeclaration(Member)) { |
| 1084 | Diag(MemberLoc, |
| 1085 | diag::err_property_found_suggest) |
| 1086 | << Member << BaseExpr.get()->getType() |
| 1087 | << FixItHint::CreateReplacement(OpLoc, "."); |
| 1088 | return ExprError(); |
| 1089 | } |
Douglas Gregor | 2b1ad8b | 2011-06-23 00:49:38 +0000 | [diff] [blame] | 1090 | Res.clear(); |
| 1091 | Res.setLookupName(Member); |
| 1092 | |
| 1093 | Diag(MemberLoc, diag::err_typecheck_member_reference_ivar) |
| 1094 | << IDecl->getDeclName() << MemberName |
| 1095 | << BaseExpr.get()->getSourceRange(); |
| 1096 | return ExprError(); |
| 1097 | } |
| 1098 | } |
| 1099 | |
| 1100 | // If the decl being referenced had an error, return an error for this |
| 1101 | // sub-expr without emitting another error, in order to avoid cascading |
| 1102 | // error cases. |
| 1103 | if (IV->isInvalidDecl()) |
| 1104 | return ExprError(); |
| 1105 | |
| 1106 | // Check whether we can reference this field. |
| 1107 | if (DiagnoseUseOfDecl(IV, MemberLoc)) |
| 1108 | return ExprError(); |
| 1109 | if (IV->getAccessControl() != ObjCIvarDecl::Public && |
| 1110 | IV->getAccessControl() != ObjCIvarDecl::Package) { |
| 1111 | ObjCInterfaceDecl *ClassOfMethodDecl = 0; |
| 1112 | if (ObjCMethodDecl *MD = getCurMethodDecl()) |
| 1113 | ClassOfMethodDecl = MD->getClassInterface(); |
| 1114 | else if (ObjCImpDecl && getCurFunctionDecl()) { |
| 1115 | // Case of a c-function declared inside an objc implementation. |
| 1116 | // FIXME: For a c-style function nested inside an objc implementation |
| 1117 | // class, there is no implementation context available, so we pass |
| 1118 | // down the context as argument to this routine. Ideally, this context |
| 1119 | // need be passed down in the AST node and somehow calculated from the |
| 1120 | // AST for a function decl. |
| 1121 | if (ObjCImplementationDecl *IMPD = |
| 1122 | dyn_cast<ObjCImplementationDecl>(ObjCImpDecl)) |
| 1123 | ClassOfMethodDecl = IMPD->getClassInterface(); |
| 1124 | else if (ObjCCategoryImplDecl* CatImplClass = |
| 1125 | dyn_cast<ObjCCategoryImplDecl>(ObjCImpDecl)) |
| 1126 | ClassOfMethodDecl = CatImplClass->getClassInterface(); |
| 1127 | } |
| 1128 | |
| 1129 | if (IV->getAccessControl() == ObjCIvarDecl::Private) { |
| 1130 | if (ClassDeclared != IDecl || |
| 1131 | ClassOfMethodDecl != ClassDeclared) |
| 1132 | Diag(MemberLoc, diag::error_private_ivar_access) |
| 1133 | << IV->getDeclName(); |
| 1134 | } else if (!IDecl->isSuperClassOf(ClassOfMethodDecl)) |
| 1135 | // @protected |
| 1136 | Diag(MemberLoc, diag::error_protected_ivar_access) |
| 1137 | << IV->getDeclName(); |
| 1138 | } |
| 1139 | if (getLangOptions().ObjCAutoRefCount) { |
| 1140 | Expr *BaseExp = BaseExpr.get()->IgnoreParenImpCasts(); |
| 1141 | if (UnaryOperator *UO = dyn_cast<UnaryOperator>(BaseExp)) |
| 1142 | if (UO->getOpcode() == UO_Deref) |
| 1143 | BaseExp = UO->getSubExpr()->IgnoreParenCasts(); |
| 1144 | |
| 1145 | if (DeclRefExpr *DE = dyn_cast<DeclRefExpr>(BaseExp)) |
| 1146 | if (DE->getType().getObjCLifetime() == Qualifiers::OCL_Weak) |
| 1147 | Diag(DE->getLocation(), diag::error_arc_weak_ivar_access); |
| 1148 | } |
| 1149 | |
| 1150 | return Owned(new (Context) ObjCIvarRefExpr(IV, IV->getType(), |
| 1151 | MemberLoc, BaseExpr.take(), |
| 1152 | IsArrow)); |
| 1153 | } |
| 1154 | |
| 1155 | // Objective-C property access. |
| 1156 | const ObjCObjectPointerType *OPT; |
| 1157 | if (!IsArrow && (OPT = BaseType->getAs<ObjCObjectPointerType>())) { |
| 1158 | // This actually uses the base as an r-value. |
| 1159 | BaseExpr = DefaultLvalueConversion(BaseExpr.take()); |
| 1160 | if (BaseExpr.isInvalid()) |
| 1161 | return ExprError(); |
| 1162 | |
| 1163 | assert(Context.hasSameUnqualifiedType(BaseType, BaseExpr.get()->getType())); |
| 1164 | |
| 1165 | IdentifierInfo *Member = MemberName.getAsIdentifierInfo(); |
| 1166 | |
| 1167 | const ObjCObjectType *OT = OPT->getObjectType(); |
| 1168 | |
| 1169 | // id, with and without qualifiers. |
| 1170 | if (OT->isObjCId()) { |
| 1171 | // Check protocols on qualified interfaces. |
| 1172 | Selector Sel = PP.getSelectorTable().getNullarySelector(Member); |
| 1173 | if (Decl *PMDecl = FindGetterSetterNameDecl(OPT, Member, Sel, Context)) { |
| 1174 | if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(PMDecl)) { |
| 1175 | // Check the use of this declaration |
| 1176 | if (DiagnoseUseOfDecl(PD, MemberLoc)) |
| 1177 | return ExprError(); |
| 1178 | |
| 1179 | QualType T = PD->getType(); |
| 1180 | if (ObjCMethodDecl *Getter = PD->getGetterMethodDecl()) |
| 1181 | T = getMessageSendResultType(BaseType, Getter, false, false); |
| 1182 | |
| 1183 | return Owned(new (Context) ObjCPropertyRefExpr(PD, T, |
| 1184 | VK_LValue, |
| 1185 | OK_ObjCProperty, |
| 1186 | MemberLoc, |
| 1187 | BaseExpr.take())); |
| 1188 | } |
| 1189 | |
| 1190 | if (ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(PMDecl)) { |
| 1191 | // Check the use of this method. |
| 1192 | if (DiagnoseUseOfDecl(OMD, MemberLoc)) |
| 1193 | return ExprError(); |
| 1194 | Selector SetterSel = |
| 1195 | SelectorTable::constructSetterName(PP.getIdentifierTable(), |
| 1196 | PP.getSelectorTable(), Member); |
| 1197 | ObjCMethodDecl *SMD = 0; |
| 1198 | if (Decl *SDecl = FindGetterSetterNameDecl(OPT, /*Property id*/0, |
| 1199 | SetterSel, Context)) |
| 1200 | SMD = dyn_cast<ObjCMethodDecl>(SDecl); |
| 1201 | QualType PType = getMessageSendResultType(BaseType, OMD, false, |
| 1202 | false); |
| 1203 | |
| 1204 | ExprValueKind VK = VK_LValue; |
| 1205 | if (!getLangOptions().CPlusPlus && PType.isCForbiddenLValueType()) |
| 1206 | VK = VK_RValue; |
| 1207 | ExprObjectKind OK = (VK == VK_RValue ? OK_Ordinary : OK_ObjCProperty); |
| 1208 | |
| 1209 | return Owned(new (Context) ObjCPropertyRefExpr(OMD, SMD, PType, |
| 1210 | VK, OK, |
| 1211 | MemberLoc, BaseExpr.take())); |
| 1212 | } |
| 1213 | } |
| 1214 | // Use of id.member can only be for a property reference. Do not |
| 1215 | // use the 'id' redefinition in this case. |
| 1216 | if (IsArrow && ShouldTryAgainWithRedefinitionType(*this, BaseExpr)) |
| 1217 | return LookupMemberExpr(R, BaseExpr, IsArrow, OpLoc, SS, |
| 1218 | ObjCImpDecl, HasTemplateArgs); |
| 1219 | |
| 1220 | return ExprError(Diag(MemberLoc, diag::err_property_not_found) |
| 1221 | << MemberName << BaseType); |
| 1222 | } |
| 1223 | |
| 1224 | // 'Class', unqualified only. |
| 1225 | if (OT->isObjCClass()) { |
| 1226 | // Only works in a method declaration (??!). |
| 1227 | ObjCMethodDecl *MD = getCurMethodDecl(); |
| 1228 | if (!MD) { |
| 1229 | if (ShouldTryAgainWithRedefinitionType(*this, BaseExpr)) |
| 1230 | return LookupMemberExpr(R, BaseExpr, IsArrow, OpLoc, SS, |
| 1231 | ObjCImpDecl, HasTemplateArgs); |
| 1232 | |
| 1233 | goto fail; |
| 1234 | } |
| 1235 | |
| 1236 | // Also must look for a getter name which uses property syntax. |
| 1237 | Selector Sel = PP.getSelectorTable().getNullarySelector(Member); |
| 1238 | ObjCInterfaceDecl *IFace = MD->getClassInterface(); |
| 1239 | ObjCMethodDecl *Getter; |
| 1240 | if ((Getter = IFace->lookupClassMethod(Sel))) { |
| 1241 | // Check the use of this method. |
| 1242 | if (DiagnoseUseOfDecl(Getter, MemberLoc)) |
| 1243 | return ExprError(); |
| 1244 | } else |
| 1245 | Getter = IFace->lookupPrivateMethod(Sel, false); |
| 1246 | // If we found a getter then this may be a valid dot-reference, we |
| 1247 | // will look for the matching setter, in case it is needed. |
| 1248 | Selector SetterSel = |
| 1249 | SelectorTable::constructSetterName(PP.getIdentifierTable(), |
| 1250 | PP.getSelectorTable(), Member); |
| 1251 | ObjCMethodDecl *Setter = IFace->lookupClassMethod(SetterSel); |
| 1252 | if (!Setter) { |
| 1253 | // If this reference is in an @implementation, also check for 'private' |
| 1254 | // methods. |
| 1255 | Setter = IFace->lookupPrivateMethod(SetterSel, false); |
| 1256 | } |
| 1257 | // Look through local category implementations associated with the class. |
| 1258 | if (!Setter) |
| 1259 | Setter = IFace->getCategoryClassMethod(SetterSel); |
| 1260 | |
| 1261 | if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) |
| 1262 | return ExprError(); |
| 1263 | |
| 1264 | if (Getter || Setter) { |
| 1265 | QualType PType; |
| 1266 | |
| 1267 | ExprValueKind VK = VK_LValue; |
| 1268 | if (Getter) { |
| 1269 | PType = getMessageSendResultType(QualType(OT, 0), Getter, true, |
| 1270 | false); |
| 1271 | if (!getLangOptions().CPlusPlus && PType.isCForbiddenLValueType()) |
| 1272 | VK = VK_RValue; |
| 1273 | } else { |
| 1274 | // Get the expression type from Setter's incoming parameter. |
| 1275 | PType = (*(Setter->param_end() -1))->getType(); |
| 1276 | } |
| 1277 | ExprObjectKind OK = (VK == VK_RValue ? OK_Ordinary : OK_ObjCProperty); |
| 1278 | |
| 1279 | // FIXME: we must check that the setter has property type. |
| 1280 | return Owned(new (Context) ObjCPropertyRefExpr(Getter, Setter, |
| 1281 | PType, VK, OK, |
| 1282 | MemberLoc, BaseExpr.take())); |
| 1283 | } |
| 1284 | |
| 1285 | if (ShouldTryAgainWithRedefinitionType(*this, BaseExpr)) |
| 1286 | return LookupMemberExpr(R, BaseExpr, IsArrow, OpLoc, SS, |
| 1287 | ObjCImpDecl, HasTemplateArgs); |
| 1288 | |
| 1289 | return ExprError(Diag(MemberLoc, diag::err_property_not_found) |
| 1290 | << MemberName << BaseType); |
| 1291 | } |
| 1292 | |
| 1293 | // Normal property access. |
Fariborz Jahanian | 6326e05 | 2011-06-28 00:00:52 +0000 | [diff] [blame^] | 1294 | return HandleExprPropertyRefExpr(OPT, BaseExpr.get(), OpLoc, |
| 1295 | MemberName, MemberLoc, |
Douglas Gregor | 2b1ad8b | 2011-06-23 00:49:38 +0000 | [diff] [blame] | 1296 | SourceLocation(), QualType(), false); |
| 1297 | } |
| 1298 | |
| 1299 | // Handle 'field access' to vectors, such as 'V.xx'. |
| 1300 | if (BaseType->isExtVectorType()) { |
| 1301 | // FIXME: this expr should store IsArrow. |
| 1302 | IdentifierInfo *Member = MemberName.getAsIdentifierInfo(); |
| 1303 | ExprValueKind VK = (IsArrow ? VK_LValue : BaseExpr.get()->getValueKind()); |
| 1304 | QualType ret = CheckExtVectorComponent(*this, BaseType, VK, OpLoc, |
| 1305 | Member, MemberLoc); |
| 1306 | if (ret.isNull()) |
| 1307 | return ExprError(); |
| 1308 | |
| 1309 | return Owned(new (Context) ExtVectorElementExpr(ret, VK, BaseExpr.take(), |
| 1310 | *Member, MemberLoc)); |
| 1311 | } |
| 1312 | |
| 1313 | // Adjust builtin-sel to the appropriate redefinition type if that's |
| 1314 | // not just a pointer to builtin-sel again. |
| 1315 | if (IsArrow && |
| 1316 | BaseType->isSpecificBuiltinType(BuiltinType::ObjCSel) && |
| 1317 | !Context.ObjCSelRedefinitionType->isObjCSelType()) { |
| 1318 | BaseExpr = ImpCastExprToType(BaseExpr.take(), Context.ObjCSelRedefinitionType, |
| 1319 | CK_BitCast); |
| 1320 | return LookupMemberExpr(R, BaseExpr, IsArrow, OpLoc, SS, |
| 1321 | ObjCImpDecl, HasTemplateArgs); |
| 1322 | } |
| 1323 | |
| 1324 | // Failure cases. |
| 1325 | fail: |
| 1326 | |
| 1327 | // Recover from dot accesses to pointers, e.g.: |
| 1328 | // type *foo; |
| 1329 | // foo.bar |
| 1330 | // This is actually well-formed in two cases: |
| 1331 | // - 'type' is an Objective C type |
| 1332 | // - 'bar' is a pseudo-destructor name which happens to refer to |
| 1333 | // the appropriate pointer type |
| 1334 | if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { |
| 1335 | if (!IsArrow && Ptr->getPointeeType()->isRecordType() && |
| 1336 | MemberName.getNameKind() != DeclarationName::CXXDestructorName) { |
| 1337 | Diag(OpLoc, diag::err_typecheck_member_reference_suggestion) |
| 1338 | << BaseType << int(IsArrow) << BaseExpr.get()->getSourceRange() |
| 1339 | << FixItHint::CreateReplacement(OpLoc, "->"); |
| 1340 | |
| 1341 | // Recurse as an -> access. |
| 1342 | IsArrow = true; |
| 1343 | return LookupMemberExpr(R, BaseExpr, IsArrow, OpLoc, SS, |
| 1344 | ObjCImpDecl, HasTemplateArgs); |
| 1345 | } |
| 1346 | } |
| 1347 | |
| 1348 | // If the user is trying to apply -> or . to a function name, it's probably |
| 1349 | // because they forgot parentheses to call that function. |
| 1350 | QualType ZeroArgCallTy; |
| 1351 | UnresolvedSet<4> Overloads; |
| 1352 | if (isExprCallable(*BaseExpr.get(), ZeroArgCallTy, Overloads)) { |
| 1353 | if (ZeroArgCallTy.isNull()) { |
| 1354 | Diag(BaseExpr.get()->getExprLoc(), diag::err_member_reference_needs_call) |
| 1355 | << (Overloads.size() > 1) << 0 << BaseExpr.get()->getSourceRange(); |
| 1356 | UnresolvedSet<2> PlausibleOverloads; |
| 1357 | for (OverloadExpr::decls_iterator It = Overloads.begin(), |
| 1358 | DeclsEnd = Overloads.end(); It != DeclsEnd; ++It) { |
| 1359 | const FunctionDecl *OverloadDecl = cast<FunctionDecl>(*It); |
| 1360 | QualType OverloadResultTy = OverloadDecl->getResultType(); |
| 1361 | if ((!IsArrow && OverloadResultTy->isRecordType()) || |
| 1362 | (IsArrow && OverloadResultTy->isPointerType() && |
| 1363 | OverloadResultTy->getPointeeType()->isRecordType())) |
| 1364 | PlausibleOverloads.addDecl(It.getDecl()); |
| 1365 | } |
| 1366 | NoteOverloads(PlausibleOverloads, BaseExpr.get()->getExprLoc()); |
| 1367 | return ExprError(); |
| 1368 | } |
| 1369 | if ((!IsArrow && ZeroArgCallTy->isRecordType()) || |
| 1370 | (IsArrow && ZeroArgCallTy->isPointerType() && |
| 1371 | ZeroArgCallTy->getPointeeType()->isRecordType())) { |
| 1372 | // At this point, we know BaseExpr looks like it's potentially callable |
| 1373 | // with 0 arguments, and that it returns something of a reasonable type, |
| 1374 | // so we can emit a fixit and carry on pretending that BaseExpr was |
| 1375 | // actually a CallExpr. |
| 1376 | SourceLocation ParenInsertionLoc = |
| 1377 | PP.getLocForEndOfToken(BaseExpr.get()->getLocEnd()); |
| 1378 | Diag(BaseExpr.get()->getExprLoc(), diag::err_member_reference_needs_call) |
| 1379 | << (Overloads.size() > 1) << 1 << BaseExpr.get()->getSourceRange() |
| 1380 | << FixItHint::CreateInsertion(ParenInsertionLoc, "()"); |
| 1381 | // FIXME: Try this before emitting the fixit, and suppress diagnostics |
| 1382 | // while doing so. |
| 1383 | ExprResult NewBase = |
| 1384 | ActOnCallExpr(0, BaseExpr.take(), ParenInsertionLoc, |
| 1385 | MultiExprArg(*this, 0, 0), |
| 1386 | ParenInsertionLoc.getFileLocWithOffset(1)); |
| 1387 | if (NewBase.isInvalid()) |
| 1388 | return ExprError(); |
| 1389 | BaseExpr = NewBase; |
| 1390 | BaseExpr = DefaultFunctionArrayConversion(BaseExpr.take()); |
| 1391 | return LookupMemberExpr(R, BaseExpr, IsArrow, OpLoc, SS, |
| 1392 | ObjCImpDecl, HasTemplateArgs); |
| 1393 | } |
| 1394 | } |
| 1395 | |
| 1396 | Diag(MemberLoc, diag::err_typecheck_member_reference_struct_union) |
| 1397 | << BaseType << BaseExpr.get()->getSourceRange(); |
| 1398 | |
| 1399 | return ExprError(); |
| 1400 | } |
| 1401 | |
| 1402 | /// The main callback when the parser finds something like |
| 1403 | /// expression . [nested-name-specifier] identifier |
| 1404 | /// expression -> [nested-name-specifier] identifier |
| 1405 | /// where 'identifier' encompasses a fairly broad spectrum of |
| 1406 | /// possibilities, including destructor and operator references. |
| 1407 | /// |
| 1408 | /// \param OpKind either tok::arrow or tok::period |
| 1409 | /// \param HasTrailingLParen whether the next token is '(', which |
| 1410 | /// is used to diagnose mis-uses of special members that can |
| 1411 | /// only be called |
| 1412 | /// \param ObjCImpDecl the current ObjC @implementation decl; |
| 1413 | /// this is an ugly hack around the fact that ObjC @implementations |
| 1414 | /// aren't properly put in the context chain |
| 1415 | ExprResult Sema::ActOnMemberAccessExpr(Scope *S, Expr *Base, |
| 1416 | SourceLocation OpLoc, |
| 1417 | tok::TokenKind OpKind, |
| 1418 | CXXScopeSpec &SS, |
| 1419 | UnqualifiedId &Id, |
| 1420 | Decl *ObjCImpDecl, |
| 1421 | bool HasTrailingLParen) { |
| 1422 | if (SS.isSet() && SS.isInvalid()) |
| 1423 | return ExprError(); |
| 1424 | |
| 1425 | // Warn about the explicit constructor calls Microsoft extension. |
| 1426 | if (getLangOptions().Microsoft && |
| 1427 | Id.getKind() == UnqualifiedId::IK_ConstructorName) |
| 1428 | Diag(Id.getSourceRange().getBegin(), |
| 1429 | diag::ext_ms_explicit_constructor_call); |
| 1430 | |
| 1431 | TemplateArgumentListInfo TemplateArgsBuffer; |
| 1432 | |
| 1433 | // Decompose the name into its component parts. |
| 1434 | DeclarationNameInfo NameInfo; |
| 1435 | const TemplateArgumentListInfo *TemplateArgs; |
| 1436 | DecomposeUnqualifiedId(Id, TemplateArgsBuffer, |
| 1437 | NameInfo, TemplateArgs); |
| 1438 | |
| 1439 | DeclarationName Name = NameInfo.getName(); |
| 1440 | bool IsArrow = (OpKind == tok::arrow); |
| 1441 | |
| 1442 | NamedDecl *FirstQualifierInScope |
| 1443 | = (!SS.isSet() ? 0 : FindFirstQualifierInScope(S, |
| 1444 | static_cast<NestedNameSpecifier*>(SS.getScopeRep()))); |
| 1445 | |
| 1446 | // This is a postfix expression, so get rid of ParenListExprs. |
| 1447 | ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Base); |
| 1448 | if (Result.isInvalid()) return ExprError(); |
| 1449 | Base = Result.take(); |
| 1450 | |
| 1451 | if (Base->getType()->isDependentType() || Name.isDependentName() || |
| 1452 | isDependentScopeSpecifier(SS)) { |
| 1453 | Result = ActOnDependentMemberExpr(Base, Base->getType(), |
| 1454 | IsArrow, OpLoc, |
| 1455 | SS, FirstQualifierInScope, |
| 1456 | NameInfo, TemplateArgs); |
| 1457 | } else { |
| 1458 | LookupResult R(*this, NameInfo, LookupMemberName); |
| 1459 | ExprResult BaseResult = Owned(Base); |
| 1460 | Result = LookupMemberExpr(R, BaseResult, IsArrow, OpLoc, |
| 1461 | SS, ObjCImpDecl, TemplateArgs != 0); |
| 1462 | if (BaseResult.isInvalid()) |
| 1463 | return ExprError(); |
| 1464 | Base = BaseResult.take(); |
| 1465 | |
| 1466 | if (Result.isInvalid()) { |
| 1467 | Owned(Base); |
| 1468 | return ExprError(); |
| 1469 | } |
| 1470 | |
| 1471 | if (Result.get()) { |
| 1472 | // The only way a reference to a destructor can be used is to |
| 1473 | // immediately call it, which falls into this case. If the |
| 1474 | // next token is not a '(', produce a diagnostic and build the |
| 1475 | // call now. |
| 1476 | if (!HasTrailingLParen && |
| 1477 | Id.getKind() == UnqualifiedId::IK_DestructorName) |
| 1478 | return DiagnoseDtorReference(NameInfo.getLoc(), Result.get()); |
| 1479 | |
| 1480 | return move(Result); |
| 1481 | } |
| 1482 | |
| 1483 | Result = BuildMemberReferenceExpr(Base, Base->getType(), |
| 1484 | OpLoc, IsArrow, SS, FirstQualifierInScope, |
| 1485 | R, TemplateArgs); |
| 1486 | } |
| 1487 | |
| 1488 | return move(Result); |
| 1489 | } |
| 1490 | |
| 1491 | static ExprResult |
| 1492 | BuildFieldReferenceExpr(Sema &S, Expr *BaseExpr, bool IsArrow, |
| 1493 | const CXXScopeSpec &SS, FieldDecl *Field, |
| 1494 | DeclAccessPair FoundDecl, |
| 1495 | const DeclarationNameInfo &MemberNameInfo) { |
| 1496 | // x.a is an l-value if 'a' has a reference type. Otherwise: |
| 1497 | // x.a is an l-value/x-value/pr-value if the base is (and note |
| 1498 | // that *x is always an l-value), except that if the base isn't |
| 1499 | // an ordinary object then we must have an rvalue. |
| 1500 | ExprValueKind VK = VK_LValue; |
| 1501 | ExprObjectKind OK = OK_Ordinary; |
| 1502 | if (!IsArrow) { |
| 1503 | if (BaseExpr->getObjectKind() == OK_Ordinary) |
| 1504 | VK = BaseExpr->getValueKind(); |
| 1505 | else |
| 1506 | VK = VK_RValue; |
| 1507 | } |
| 1508 | if (VK != VK_RValue && Field->isBitField()) |
| 1509 | OK = OK_BitField; |
| 1510 | |
| 1511 | // Figure out the type of the member; see C99 6.5.2.3p3, C++ [expr.ref] |
| 1512 | QualType MemberType = Field->getType(); |
| 1513 | if (const ReferenceType *Ref = MemberType->getAs<ReferenceType>()) { |
| 1514 | MemberType = Ref->getPointeeType(); |
| 1515 | VK = VK_LValue; |
| 1516 | } else { |
| 1517 | QualType BaseType = BaseExpr->getType(); |
| 1518 | if (IsArrow) BaseType = BaseType->getAs<PointerType>()->getPointeeType(); |
| 1519 | |
| 1520 | Qualifiers BaseQuals = BaseType.getQualifiers(); |
| 1521 | |
| 1522 | // GC attributes are never picked up by members. |
| 1523 | BaseQuals.removeObjCGCAttr(); |
| 1524 | |
| 1525 | // CVR attributes from the base are picked up by members, |
| 1526 | // except that 'mutable' members don't pick up 'const'. |
| 1527 | if (Field->isMutable()) BaseQuals.removeConst(); |
| 1528 | |
| 1529 | Qualifiers MemberQuals |
| 1530 | = S.Context.getCanonicalType(MemberType).getQualifiers(); |
| 1531 | |
| 1532 | // TR 18037 does not allow fields to be declared with address spaces. |
| 1533 | assert(!MemberQuals.hasAddressSpace()); |
| 1534 | |
| 1535 | Qualifiers Combined = BaseQuals + MemberQuals; |
| 1536 | if (Combined != MemberQuals) |
| 1537 | MemberType = S.Context.getQualifiedType(MemberType, Combined); |
| 1538 | } |
| 1539 | |
| 1540 | S.MarkDeclarationReferenced(MemberNameInfo.getLoc(), Field); |
| 1541 | ExprResult Base = |
| 1542 | S.PerformObjectMemberConversion(BaseExpr, SS.getScopeRep(), |
| 1543 | FoundDecl, Field); |
| 1544 | if (Base.isInvalid()) |
| 1545 | return ExprError(); |
| 1546 | return S.Owned(BuildMemberExpr(S.Context, Base.take(), IsArrow, SS, |
| 1547 | Field, FoundDecl, MemberNameInfo, |
| 1548 | MemberType, VK, OK)); |
| 1549 | } |
| 1550 | |
| 1551 | /// Builds an implicit member access expression. The current context |
| 1552 | /// is known to be an instance method, and the given unqualified lookup |
| 1553 | /// set is known to contain only instance members, at least one of which |
| 1554 | /// is from an appropriate type. |
| 1555 | ExprResult |
| 1556 | Sema::BuildImplicitMemberExpr(const CXXScopeSpec &SS, |
| 1557 | LookupResult &R, |
| 1558 | const TemplateArgumentListInfo *TemplateArgs, |
| 1559 | bool IsKnownInstance) { |
| 1560 | assert(!R.empty() && !R.isAmbiguous()); |
| 1561 | |
| 1562 | SourceLocation loc = R.getNameLoc(); |
| 1563 | |
| 1564 | // We may have found a field within an anonymous union or struct |
| 1565 | // (C++ [class.union]). |
| 1566 | // FIXME: template-ids inside anonymous structs? |
| 1567 | if (IndirectFieldDecl *FD = R.getAsSingle<IndirectFieldDecl>()) |
| 1568 | return BuildAnonymousStructUnionMemberReference(SS, R.getNameLoc(), FD); |
| 1569 | |
| 1570 | // If this is known to be an instance access, go ahead and build an |
| 1571 | // implicit 'this' expression now. |
| 1572 | // 'this' expression now. |
| 1573 | QualType ThisTy = getAndCaptureCurrentThisType(); |
| 1574 | assert(!ThisTy.isNull() && "didn't correctly pre-flight capture of 'this'"); |
| 1575 | |
| 1576 | Expr *baseExpr = 0; // null signifies implicit access |
| 1577 | if (IsKnownInstance) { |
| 1578 | SourceLocation Loc = R.getNameLoc(); |
| 1579 | if (SS.getRange().isValid()) |
| 1580 | Loc = SS.getRange().getBegin(); |
| 1581 | baseExpr = new (Context) CXXThisExpr(loc, ThisTy, /*isImplicit=*/true); |
| 1582 | } |
| 1583 | |
| 1584 | return BuildMemberReferenceExpr(baseExpr, ThisTy, |
| 1585 | /*OpLoc*/ SourceLocation(), |
| 1586 | /*IsArrow*/ true, |
| 1587 | SS, |
| 1588 | /*FirstQualifierInScope*/ 0, |
| 1589 | R, TemplateArgs); |
| 1590 | } |