Cedric Venet | 3d65864 | 2009-02-14 20:20:19 +0000 | [diff] [blame] | 1 | //===--- SemaCXXScopeSpec.cpp - Semantic Analysis for C++ scope specifiers-===// |
| 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 C++ semantic analysis for scope specifiers. |
| 11 | // |
| 12 | //===----------------------------------------------------------------------===// |
| 13 | |
John McCall | 2d88708 | 2010-08-25 22:03:47 +0000 | [diff] [blame] | 14 | #include "clang/Sema/SemaInternal.h" |
Douglas Gregor | e737f50 | 2010-08-12 20:07:10 +0000 | [diff] [blame] | 15 | #include "clang/Sema/Lookup.h" |
Cedric Venet | 3d65864 | 2009-02-14 20:20:19 +0000 | [diff] [blame] | 16 | #include "clang/AST/ASTContext.h" |
Douglas Gregor | 42af25f | 2009-05-11 19:58:34 +0000 | [diff] [blame] | 17 | #include "clang/AST/DeclTemplate.h" |
Douglas Gregor | fe85ced | 2009-08-06 03:17:00 +0000 | [diff] [blame] | 18 | #include "clang/AST/ExprCXX.h" |
Douglas Gregor | e4e5b05 | 2009-03-19 00:18:19 +0000 | [diff] [blame] | 19 | #include "clang/AST/NestedNameSpecifier.h" |
Anders Carlsson | b790661 | 2009-08-26 23:45:07 +0000 | [diff] [blame] | 20 | #include "clang/Basic/PartialDiagnostic.h" |
John McCall | 1951085 | 2010-08-20 18:27:03 +0000 | [diff] [blame] | 21 | #include "clang/Sema/DeclSpec.h" |
Douglas Gregor | 2e4c34a | 2011-02-24 00:17:56 +0000 | [diff] [blame^] | 22 | #include "TypeLocBuilder.h" |
Cedric Venet | 3d65864 | 2009-02-14 20:20:19 +0000 | [diff] [blame] | 23 | #include "llvm/ADT/STLExtras.h" |
Douglas Gregor | 7551c18 | 2009-07-22 00:28:09 +0000 | [diff] [blame] | 24 | #include "llvm/Support/raw_ostream.h" |
Cedric Venet | 3d65864 | 2009-02-14 20:20:19 +0000 | [diff] [blame] | 25 | using namespace clang; |
| 26 | |
Douglas Gregor | 43d8863 | 2009-11-04 22:49:18 +0000 | [diff] [blame] | 27 | /// \brief Find the current instantiation that associated with the given type. |
Douglas Gregor | d9ea180 | 2011-02-19 19:24:40 +0000 | [diff] [blame] | 28 | static CXXRecordDecl *getCurrentInstantiationOf(QualType T, |
| 29 | DeclContext *CurContext) { |
Douglas Gregor | 43d8863 | 2009-11-04 22:49:18 +0000 | [diff] [blame] | 30 | if (T.isNull()) |
| 31 | return 0; |
John McCall | 31f17ec | 2010-04-27 00:57:59 +0000 | [diff] [blame] | 32 | |
| 33 | const Type *Ty = T->getCanonicalTypeInternal().getTypePtr(); |
Douglas Gregor | d9ea180 | 2011-02-19 19:24:40 +0000 | [diff] [blame] | 34 | if (const RecordType *RecordTy = dyn_cast<RecordType>(Ty)) { |
| 35 | CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordTy->getDecl()); |
| 36 | if (!T->isDependentType()) |
| 37 | return Record; |
| 38 | |
| 39 | // This may be a member of a class template or class template partial |
| 40 | // specialization. If it's part of the current semantic context, then it's |
| 41 | // an injected-class-name; |
| 42 | for (; !CurContext->isFileContext(); CurContext = CurContext->getParent()) |
| 43 | if (CurContext->Equals(Record)) |
| 44 | return Record; |
| 45 | |
| 46 | return 0; |
| 47 | } else if (isa<InjectedClassNameType>(Ty)) |
John McCall | 31f17ec | 2010-04-27 00:57:59 +0000 | [diff] [blame] | 48 | return cast<InjectedClassNameType>(Ty)->getDecl(); |
| 49 | else |
| 50 | return 0; |
Douglas Gregor | 43d8863 | 2009-11-04 22:49:18 +0000 | [diff] [blame] | 51 | } |
| 52 | |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 53 | /// \brief Compute the DeclContext that is associated with the given type. |
| 54 | /// |
| 55 | /// \param T the type for which we are attempting to find a DeclContext. |
| 56 | /// |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 57 | /// \returns the declaration context represented by the type T, |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 58 | /// or NULL if the declaration context cannot be computed (e.g., because it is |
| 59 | /// dependent and not the current instantiation). |
| 60 | DeclContext *Sema::computeDeclContext(QualType T) { |
Douglas Gregor | d9ea180 | 2011-02-19 19:24:40 +0000 | [diff] [blame] | 61 | if (!T->isDependentType()) |
| 62 | if (const TagType *Tag = T->getAs<TagType>()) |
| 63 | return Tag->getDecl(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 64 | |
Douglas Gregor | d9ea180 | 2011-02-19 19:24:40 +0000 | [diff] [blame] | 65 | return ::getCurrentInstantiationOf(T, CurContext); |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 66 | } |
| 67 | |
Douglas Gregor | e4e5b05 | 2009-03-19 00:18:19 +0000 | [diff] [blame] | 68 | /// \brief Compute the DeclContext that is associated with the given |
| 69 | /// scope specifier. |
Douglas Gregor | f59a56e | 2009-07-21 23:53:31 +0000 | [diff] [blame] | 70 | /// |
| 71 | /// \param SS the C++ scope specifier as it appears in the source |
| 72 | /// |
| 73 | /// \param EnteringContext when true, we will be entering the context of |
| 74 | /// this scope specifier, so we can retrieve the declaration context of a |
| 75 | /// class template or class template partial specialization even if it is |
| 76 | /// not the current instantiation. |
| 77 | /// |
| 78 | /// \returns the declaration context represented by the scope specifier @p SS, |
| 79 | /// or NULL if the declaration context cannot be computed (e.g., because it is |
| 80 | /// dependent and not the current instantiation). |
| 81 | DeclContext *Sema::computeDeclContext(const CXXScopeSpec &SS, |
| 82 | bool EnteringContext) { |
Douglas Gregor | e4e5b05 | 2009-03-19 00:18:19 +0000 | [diff] [blame] | 83 | if (!SS.isSet() || SS.isInvalid()) |
Douglas Gregor | ca5e77f | 2009-03-18 00:36:05 +0000 | [diff] [blame] | 84 | return 0; |
Douglas Gregor | ca5e77f | 2009-03-18 00:36:05 +0000 | [diff] [blame] | 85 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 86 | NestedNameSpecifier *NNS |
Douglas Gregor | 3507369 | 2009-03-26 23:56:24 +0000 | [diff] [blame] | 87 | = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); |
Douglas Gregor | 42af25f | 2009-05-11 19:58:34 +0000 | [diff] [blame] | 88 | if (NNS->isDependent()) { |
| 89 | // If this nested-name-specifier refers to the current |
| 90 | // instantiation, return its DeclContext. |
| 91 | if (CXXRecordDecl *Record = getCurrentInstantiationOf(NNS)) |
| 92 | return Record; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 93 | |
Douglas Gregor | f59a56e | 2009-07-21 23:53:31 +0000 | [diff] [blame] | 94 | if (EnteringContext) { |
John McCall | 3cb0ebd | 2010-03-10 03:28:59 +0000 | [diff] [blame] | 95 | const Type *NNSType = NNS->getAsType(); |
| 96 | if (!NNSType) { |
| 97 | // do nothing, fall out |
| 98 | } else if (const TemplateSpecializationType *SpecType |
| 99 | = NNSType->getAs<TemplateSpecializationType>()) { |
Douglas Gregor | 495c35d | 2009-08-25 22:51:20 +0000 | [diff] [blame] | 100 | // We are entering the context of the nested name specifier, so try to |
| 101 | // match the nested name specifier to either a primary class template |
| 102 | // or a class template partial specialization. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 103 | if (ClassTemplateDecl *ClassTemplate |
Douglas Gregor | f59a56e | 2009-07-21 23:53:31 +0000 | [diff] [blame] | 104 | = dyn_cast_or_null<ClassTemplateDecl>( |
| 105 | SpecType->getTemplateName().getAsTemplateDecl())) { |
Douglas Gregor | b88e888 | 2009-07-30 17:40:51 +0000 | [diff] [blame] | 106 | QualType ContextType |
| 107 | = Context.getCanonicalType(QualType(SpecType, 0)); |
| 108 | |
Douglas Gregor | f59a56e | 2009-07-21 23:53:31 +0000 | [diff] [blame] | 109 | // If the type of the nested name specifier is the same as the |
| 110 | // injected class name of the named class template, we're entering |
| 111 | // into that class template definition. |
John McCall | 3cb0ebd | 2010-03-10 03:28:59 +0000 | [diff] [blame] | 112 | QualType Injected |
Douglas Gregor | 24bae92 | 2010-07-08 18:37:38 +0000 | [diff] [blame] | 113 | = ClassTemplate->getInjectedClassNameSpecialization(); |
Douglas Gregor | b88e888 | 2009-07-30 17:40:51 +0000 | [diff] [blame] | 114 | if (Context.hasSameType(Injected, ContextType)) |
Douglas Gregor | f59a56e | 2009-07-21 23:53:31 +0000 | [diff] [blame] | 115 | return ClassTemplate->getTemplatedDecl(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 116 | |
Douglas Gregor | b88e888 | 2009-07-30 17:40:51 +0000 | [diff] [blame] | 117 | // If the type of the nested name specifier is the same as the |
| 118 | // type of one of the class template's class template partial |
| 119 | // specializations, we're entering into the definition of that |
| 120 | // class template partial specialization. |
| 121 | if (ClassTemplatePartialSpecializationDecl *PartialSpec |
| 122 | = ClassTemplate->findPartialSpecialization(ContextType)) |
| 123 | return PartialSpec; |
Douglas Gregor | f59a56e | 2009-07-21 23:53:31 +0000 | [diff] [blame] | 124 | } |
John McCall | 3cb0ebd | 2010-03-10 03:28:59 +0000 | [diff] [blame] | 125 | } else if (const RecordType *RecordT = NNSType->getAs<RecordType>()) { |
Douglas Gregor | 495c35d | 2009-08-25 22:51:20 +0000 | [diff] [blame] | 126 | // The nested name specifier refers to a member of a class template. |
| 127 | return RecordT->getDecl(); |
Douglas Gregor | f59a56e | 2009-07-21 23:53:31 +0000 | [diff] [blame] | 128 | } |
| 129 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 130 | |
Douglas Gregor | f59a56e | 2009-07-21 23:53:31 +0000 | [diff] [blame] | 131 | return 0; |
Douglas Gregor | 42af25f | 2009-05-11 19:58:34 +0000 | [diff] [blame] | 132 | } |
Douglas Gregor | ab452ba | 2009-03-26 23:50:42 +0000 | [diff] [blame] | 133 | |
| 134 | switch (NNS->getKind()) { |
| 135 | case NestedNameSpecifier::Identifier: |
| 136 | assert(false && "Dependent nested-name-specifier has no DeclContext"); |
| 137 | break; |
| 138 | |
| 139 | case NestedNameSpecifier::Namespace: |
| 140 | return NNS->getAsNamespace(); |
| 141 | |
| 142 | case NestedNameSpecifier::TypeSpec: |
| 143 | case NestedNameSpecifier::TypeSpecWithTemplate: { |
Douglas Gregor | edc9050 | 2010-02-25 04:46:04 +0000 | [diff] [blame] | 144 | const TagType *Tag = NNS->getAsType()->getAs<TagType>(); |
| 145 | assert(Tag && "Non-tag type in nested-name-specifier"); |
| 146 | return Tag->getDecl(); |
| 147 | } break; |
Douglas Gregor | ab452ba | 2009-03-26 23:50:42 +0000 | [diff] [blame] | 148 | |
| 149 | case NestedNameSpecifier::Global: |
| 150 | return Context.getTranslationUnitDecl(); |
| 151 | } |
| 152 | |
Douglas Gregor | edc9050 | 2010-02-25 04:46:04 +0000 | [diff] [blame] | 153 | // Required to silence a GCC warning. |
Douglas Gregor | ab452ba | 2009-03-26 23:50:42 +0000 | [diff] [blame] | 154 | return 0; |
Douglas Gregor | ca5e77f | 2009-03-18 00:36:05 +0000 | [diff] [blame] | 155 | } |
| 156 | |
Douglas Gregor | 5953d8b | 2009-03-19 17:26:29 +0000 | [diff] [blame] | 157 | bool Sema::isDependentScopeSpecifier(const CXXScopeSpec &SS) { |
| 158 | if (!SS.isSet() || SS.isInvalid()) |
| 159 | return false; |
| 160 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 161 | NestedNameSpecifier *NNS |
Douglas Gregor | 3507369 | 2009-03-26 23:56:24 +0000 | [diff] [blame] | 162 | = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); |
Douglas Gregor | ab452ba | 2009-03-26 23:50:42 +0000 | [diff] [blame] | 163 | return NNS->isDependent(); |
Douglas Gregor | 5953d8b | 2009-03-19 17:26:29 +0000 | [diff] [blame] | 164 | } |
| 165 | |
Douglas Gregor | 42af25f | 2009-05-11 19:58:34 +0000 | [diff] [blame] | 166 | // \brief Determine whether this C++ scope specifier refers to an |
| 167 | // unknown specialization, i.e., a dependent type that is not the |
| 168 | // current instantiation. |
| 169 | bool Sema::isUnknownSpecialization(const CXXScopeSpec &SS) { |
| 170 | if (!isDependentScopeSpecifier(SS)) |
| 171 | return false; |
| 172 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 173 | NestedNameSpecifier *NNS |
Douglas Gregor | 42af25f | 2009-05-11 19:58:34 +0000 | [diff] [blame] | 174 | = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); |
| 175 | return getCurrentInstantiationOf(NNS) == 0; |
| 176 | } |
| 177 | |
| 178 | /// \brief If the given nested name specifier refers to the current |
| 179 | /// instantiation, return the declaration that corresponds to that |
| 180 | /// current instantiation (C++0x [temp.dep.type]p1). |
| 181 | /// |
| 182 | /// \param NNS a dependent nested name specifier. |
| 183 | CXXRecordDecl *Sema::getCurrentInstantiationOf(NestedNameSpecifier *NNS) { |
| 184 | assert(getLangOptions().CPlusPlus && "Only callable in C++"); |
| 185 | assert(NNS->isDependent() && "Only dependent nested-name-specifier allowed"); |
| 186 | |
Douglas Gregor | f59a56e | 2009-07-21 23:53:31 +0000 | [diff] [blame] | 187 | if (!NNS->getAsType()) |
| 188 | return 0; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 189 | |
Douglas Gregor | 1560def | 2009-07-31 18:32:42 +0000 | [diff] [blame] | 190 | QualType T = QualType(NNS->getAsType(), 0); |
Douglas Gregor | d9ea180 | 2011-02-19 19:24:40 +0000 | [diff] [blame] | 191 | return ::getCurrentInstantiationOf(T, CurContext); |
Douglas Gregor | 42af25f | 2009-05-11 19:58:34 +0000 | [diff] [blame] | 192 | } |
| 193 | |
Douglas Gregor | 4fdf1fa | 2009-03-11 16:48:53 +0000 | [diff] [blame] | 194 | /// \brief Require that the context specified by SS be complete. |
| 195 | /// |
| 196 | /// If SS refers to a type, this routine checks whether the type is |
| 197 | /// complete enough (or can be made complete enough) for name lookup |
| 198 | /// into the DeclContext. A type that is not yet completed can be |
| 199 | /// considered "complete enough" if it is a class/struct/union/enum |
| 200 | /// that is currently being defined. Or, if we have a type that names |
| 201 | /// a class template specialization that is not a complete type, we |
| 202 | /// will attempt to instantiate that class template. |
John McCall | 77bb1aa | 2010-05-01 00:40:08 +0000 | [diff] [blame] | 203 | bool Sema::RequireCompleteDeclContext(CXXScopeSpec &SS, |
| 204 | DeclContext *DC) { |
| 205 | assert(DC != 0 && "given null context"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 206 | |
Douglas Gregor | 4fdf1fa | 2009-03-11 16:48:53 +0000 | [diff] [blame] | 207 | if (TagDecl *Tag = dyn_cast<TagDecl>(DC)) { |
Douglas Gregor | a4e8c2a | 2010-02-05 04:39:02 +0000 | [diff] [blame] | 208 | // If this is a dependent type, then we consider it complete. |
| 209 | if (Tag->isDependentContext()) |
| 210 | return false; |
| 211 | |
Douglas Gregor | 4fdf1fa | 2009-03-11 16:48:53 +0000 | [diff] [blame] | 212 | // If we're currently defining this type, then lookup into the |
| 213 | // type is okay: don't complain that it isn't complete yet. |
Ted Kremenek | 6217b80 | 2009-07-29 21:53:49 +0000 | [diff] [blame] | 214 | const TagType *TagT = Context.getTypeDeclType(Tag)->getAs<TagType>(); |
John McCall | 3cb0ebd | 2010-03-10 03:28:59 +0000 | [diff] [blame] | 215 | if (TagT && TagT->isBeingDefined()) |
Douglas Gregor | 4fdf1fa | 2009-03-11 16:48:53 +0000 | [diff] [blame] | 216 | return false; |
| 217 | |
| 218 | // The type must be complete. |
Jeffrey Yasskin | 9ab1454 | 2010-04-08 16:38:48 +0000 | [diff] [blame] | 219 | if (RequireCompleteType(SS.getRange().getBegin(), |
| 220 | Context.getTypeDeclType(Tag), |
| 221 | PDiag(diag::err_incomplete_nested_name_spec) |
John McCall | 77bb1aa | 2010-05-01 00:40:08 +0000 | [diff] [blame] | 222 | << SS.getRange())) { |
Douglas Gregor | 2e4c34a | 2011-02-24 00:17:56 +0000 | [diff] [blame^] | 223 | SS.SetInvalid(SS.getRange()); |
Jeffrey Yasskin | 9ab1454 | 2010-04-08 16:38:48 +0000 | [diff] [blame] | 224 | return true; |
| 225 | } |
Douglas Gregor | 4fdf1fa | 2009-03-11 16:48:53 +0000 | [diff] [blame] | 226 | } |
| 227 | |
| 228 | return false; |
| 229 | } |
Cedric Venet | 3d65864 | 2009-02-14 20:20:19 +0000 | [diff] [blame] | 230 | |
Douglas Gregor | 2e4c34a | 2011-02-24 00:17:56 +0000 | [diff] [blame^] | 231 | bool Sema::ActOnCXXGlobalScopeSpecifier(Scope *S, SourceLocation CCLoc, |
| 232 | CXXScopeSpec &SS) { |
| 233 | SS.MakeGlobal(Context, CCLoc); |
| 234 | return false; |
Cedric Venet | 3d65864 | 2009-02-14 20:20:19 +0000 | [diff] [blame] | 235 | } |
| 236 | |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 237 | /// \brief Determines whether the given declaration is an valid acceptable |
| 238 | /// result for name lookup of a nested-name-specifier. |
Douglas Gregor | edc9050 | 2010-02-25 04:46:04 +0000 | [diff] [blame] | 239 | bool Sema::isAcceptableNestedNameSpecifier(NamedDecl *SD) { |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 240 | if (!SD) |
| 241 | return false; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 242 | |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 243 | // Namespace and namespace aliases are fine. |
| 244 | if (isa<NamespaceDecl>(SD) || isa<NamespaceAliasDecl>(SD)) |
| 245 | return true; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 246 | |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 247 | if (!isa<TypeDecl>(SD)) |
| 248 | return false; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 249 | |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 250 | // Determine whether we have a class (or, in C++0x, an enum) or |
| 251 | // a typedef thereof. If so, build the nested-name-specifier. |
| 252 | QualType T = Context.getTypeDeclType(cast<TypeDecl>(SD)); |
| 253 | if (T->isDependentType()) |
| 254 | return true; |
| 255 | else if (TypedefDecl *TD = dyn_cast<TypedefDecl>(SD)) { |
| 256 | if (TD->getUnderlyingType()->isRecordType() || |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 257 | (Context.getLangOptions().CPlusPlus0x && |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 258 | TD->getUnderlyingType()->isEnumeralType())) |
| 259 | return true; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 260 | } else if (isa<RecordDecl>(SD) || |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 261 | (Context.getLangOptions().CPlusPlus0x && isa<EnumDecl>(SD))) |
| 262 | return true; |
| 263 | |
| 264 | return false; |
| 265 | } |
| 266 | |
Douglas Gregor | c68afe2 | 2009-09-03 21:38:09 +0000 | [diff] [blame] | 267 | /// \brief If the given nested-name-specifier begins with a bare identifier |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 268 | /// (e.g., Base::), perform name lookup for that identifier as a |
Douglas Gregor | c68afe2 | 2009-09-03 21:38:09 +0000 | [diff] [blame] | 269 | /// nested-name-specifier within the given scope, and return the result of that |
| 270 | /// name lookup. |
| 271 | NamedDecl *Sema::FindFirstQualifierInScope(Scope *S, NestedNameSpecifier *NNS) { |
| 272 | if (!S || !NNS) |
| 273 | return 0; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 274 | |
Douglas Gregor | c68afe2 | 2009-09-03 21:38:09 +0000 | [diff] [blame] | 275 | while (NNS->getPrefix()) |
| 276 | NNS = NNS->getPrefix(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 277 | |
Douglas Gregor | c68afe2 | 2009-09-03 21:38:09 +0000 | [diff] [blame] | 278 | if (NNS->getKind() != NestedNameSpecifier::Identifier) |
| 279 | return 0; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 280 | |
John McCall | a24dc2e | 2009-11-17 02:14:36 +0000 | [diff] [blame] | 281 | LookupResult Found(*this, NNS->getAsIdentifier(), SourceLocation(), |
| 282 | LookupNestedNameSpecifierName); |
| 283 | LookupName(Found, S); |
Douglas Gregor | c68afe2 | 2009-09-03 21:38:09 +0000 | [diff] [blame] | 284 | assert(!Found.isAmbiguous() && "Cannot handle ambiguities here yet"); |
| 285 | |
John McCall | 1bcee0a | 2009-12-02 08:25:40 +0000 | [diff] [blame] | 286 | if (!Found.isSingleResult()) |
| 287 | return 0; |
| 288 | |
| 289 | NamedDecl *Result = Found.getFoundDecl(); |
Douglas Gregor | edc9050 | 2010-02-25 04:46:04 +0000 | [diff] [blame] | 290 | if (isAcceptableNestedNameSpecifier(Result)) |
Douglas Gregor | c68afe2 | 2009-09-03 21:38:09 +0000 | [diff] [blame] | 291 | return Result; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 292 | |
Douglas Gregor | c68afe2 | 2009-09-03 21:38:09 +0000 | [diff] [blame] | 293 | return 0; |
| 294 | } |
| 295 | |
Jeffrey Yasskin | 9ab1454 | 2010-04-08 16:38:48 +0000 | [diff] [blame] | 296 | bool Sema::isNonTypeNestedNameSpecifier(Scope *S, CXXScopeSpec &SS, |
Douglas Gregor | 7754908 | 2010-02-24 21:29:12 +0000 | [diff] [blame] | 297 | SourceLocation IdLoc, |
| 298 | IdentifierInfo &II, |
John McCall | b3d8748 | 2010-08-24 05:47:05 +0000 | [diff] [blame] | 299 | ParsedType ObjectTypePtr) { |
Douglas Gregor | 7754908 | 2010-02-24 21:29:12 +0000 | [diff] [blame] | 300 | QualType ObjectType = GetTypeFromParser(ObjectTypePtr); |
| 301 | LookupResult Found(*this, &II, IdLoc, LookupNestedNameSpecifierName); |
| 302 | |
| 303 | // Determine where to perform name lookup |
| 304 | DeclContext *LookupCtx = 0; |
| 305 | bool isDependent = false; |
| 306 | if (!ObjectType.isNull()) { |
| 307 | // This nested-name-specifier occurs in a member access expression, e.g., |
| 308 | // x->B::f, and we are looking into the type of the object. |
| 309 | assert(!SS.isSet() && "ObjectType and scope specifier cannot coexist"); |
| 310 | LookupCtx = computeDeclContext(ObjectType); |
| 311 | isDependent = ObjectType->isDependentType(); |
| 312 | } else if (SS.isSet()) { |
| 313 | // This nested-name-specifier occurs after another nested-name-specifier, |
| 314 | // so long into the context associated with the prior nested-name-specifier. |
| 315 | LookupCtx = computeDeclContext(SS, false); |
| 316 | isDependent = isDependentScopeSpecifier(SS); |
| 317 | Found.setContextRange(SS.getRange()); |
| 318 | } |
| 319 | |
| 320 | if (LookupCtx) { |
| 321 | // Perform "qualified" name lookup into the declaration context we |
| 322 | // computed, which is either the type of the base of a member access |
| 323 | // expression or the declaration context associated with a prior |
| 324 | // nested-name-specifier. |
| 325 | |
| 326 | // The declaration context must be complete. |
John McCall | 77bb1aa | 2010-05-01 00:40:08 +0000 | [diff] [blame] | 327 | if (!LookupCtx->isDependentContext() && |
| 328 | RequireCompleteDeclContext(SS, LookupCtx)) |
Douglas Gregor | 7754908 | 2010-02-24 21:29:12 +0000 | [diff] [blame] | 329 | return false; |
| 330 | |
| 331 | LookupQualifiedName(Found, LookupCtx); |
| 332 | } else if (isDependent) { |
| 333 | return false; |
| 334 | } else { |
| 335 | LookupName(Found, S); |
| 336 | } |
| 337 | Found.suppressDiagnostics(); |
| 338 | |
| 339 | if (NamedDecl *ND = Found.getAsSingle<NamedDecl>()) |
| 340 | return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); |
| 341 | |
| 342 | return false; |
| 343 | } |
| 344 | |
Douglas Gregor | c68afe2 | 2009-09-03 21:38:09 +0000 | [diff] [blame] | 345 | /// \brief Build a new nested-name-specifier for "identifier::", as described |
| 346 | /// by ActOnCXXNestedNameSpecifier. |
| 347 | /// |
| 348 | /// This routine differs only slightly from ActOnCXXNestedNameSpecifier, in |
| 349 | /// that it contains an extra parameter \p ScopeLookupResult, which provides |
| 350 | /// the result of name lookup within the scope of the nested-name-specifier |
Douglas Gregor | a6e5199 | 2009-12-30 16:01:52 +0000 | [diff] [blame] | 351 | /// that was computed at template definition time. |
Chris Lattner | 4664649 | 2009-12-07 01:36:53 +0000 | [diff] [blame] | 352 | /// |
| 353 | /// If ErrorRecoveryLookup is true, then this call is used to improve error |
| 354 | /// recovery. This means that it should not emit diagnostics, it should |
Douglas Gregor | 2e4c34a | 2011-02-24 00:17:56 +0000 | [diff] [blame^] | 355 | /// just return true on failure. It also means it should only return a valid |
Chris Lattner | 4664649 | 2009-12-07 01:36:53 +0000 | [diff] [blame] | 356 | /// scope if it *knows* that the result is correct. It should not return in a |
Douglas Gregor | 2e4c34a | 2011-02-24 00:17:56 +0000 | [diff] [blame^] | 357 | /// dependent context, for example. Nor will it extend \p SS with the scope |
| 358 | /// specifier. |
| 359 | bool Sema::BuildCXXNestedNameSpecifier(Scope *S, |
| 360 | IdentifierInfo &Identifier, |
| 361 | SourceLocation IdentifierLoc, |
| 362 | SourceLocation CCLoc, |
| 363 | QualType ObjectType, |
| 364 | bool EnteringContext, |
| 365 | CXXScopeSpec &SS, |
| 366 | NamedDecl *ScopeLookupResult, |
| 367 | bool ErrorRecoveryLookup) { |
| 368 | LookupResult Found(*this, &Identifier, IdentifierLoc, |
| 369 | LookupNestedNameSpecifierName); |
John McCall | a24dc2e | 2009-11-17 02:14:36 +0000 | [diff] [blame] | 370 | |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 371 | // Determine where to perform name lookup |
| 372 | DeclContext *LookupCtx = 0; |
| 373 | bool isDependent = false; |
Douglas Gregor | c68afe2 | 2009-09-03 21:38:09 +0000 | [diff] [blame] | 374 | if (!ObjectType.isNull()) { |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 375 | // This nested-name-specifier occurs in a member access expression, e.g., |
| 376 | // x->B::f, and we are looking into the type of the object. |
| 377 | assert(!SS.isSet() && "ObjectType and scope specifier cannot coexist"); |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 378 | LookupCtx = computeDeclContext(ObjectType); |
| 379 | isDependent = ObjectType->isDependentType(); |
| 380 | } else if (SS.isSet()) { |
| 381 | // This nested-name-specifier occurs after another nested-name-specifier, |
| 382 | // so long into the context associated with the prior nested-name-specifier. |
| 383 | LookupCtx = computeDeclContext(SS, EnteringContext); |
| 384 | isDependent = isDependentScopeSpecifier(SS); |
John McCall | a24dc2e | 2009-11-17 02:14:36 +0000 | [diff] [blame] | 385 | Found.setContextRange(SS.getRange()); |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 386 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 387 | |
John McCall | a24dc2e | 2009-11-17 02:14:36 +0000 | [diff] [blame] | 388 | |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 389 | bool ObjectTypeSearchedInScope = false; |
| 390 | if (LookupCtx) { |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 391 | // Perform "qualified" name lookup into the declaration context we |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 392 | // computed, which is either the type of the base of a member access |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 393 | // expression or the declaration context associated with a prior |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 394 | // nested-name-specifier. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 395 | |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 396 | // The declaration context must be complete. |
John McCall | 77bb1aa | 2010-05-01 00:40:08 +0000 | [diff] [blame] | 397 | if (!LookupCtx->isDependentContext() && |
| 398 | RequireCompleteDeclContext(SS, LookupCtx)) |
Douglas Gregor | 2e4c34a | 2011-02-24 00:17:56 +0000 | [diff] [blame^] | 399 | return true; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 400 | |
John McCall | a24dc2e | 2009-11-17 02:14:36 +0000 | [diff] [blame] | 401 | LookupQualifiedName(Found, LookupCtx); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 402 | |
John McCall | a24dc2e | 2009-11-17 02:14:36 +0000 | [diff] [blame] | 403 | if (!ObjectType.isNull() && Found.empty()) { |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 404 | // C++ [basic.lookup.classref]p4: |
| 405 | // If the id-expression in a class member access is a qualified-id of |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 406 | // the form |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 407 | // |
| 408 | // class-name-or-namespace-name::... |
| 409 | // |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 410 | // the class-name-or-namespace-name following the . or -> operator is |
| 411 | // looked up both in the context of the entire postfix-expression and in |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 412 | // the scope of the class of the object expression. If the name is found |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 413 | // only in the scope of the class of the object expression, the name |
| 414 | // shall refer to a class-name. If the name is found only in the |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 415 | // context of the entire postfix-expression, the name shall refer to a |
| 416 | // class-name or namespace-name. [...] |
| 417 | // |
| 418 | // Qualified name lookup into a class will not find a namespace-name, |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 419 | // so we do not need to diagnoste that case specifically. However, |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 420 | // this qualified name lookup may find nothing. In that case, perform |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 421 | // unqualified name lookup in the given scope (if available) or |
Douglas Gregor | c68afe2 | 2009-09-03 21:38:09 +0000 | [diff] [blame] | 422 | // reconstruct the result from when name lookup was performed at template |
| 423 | // definition time. |
| 424 | if (S) |
John McCall | a24dc2e | 2009-11-17 02:14:36 +0000 | [diff] [blame] | 425 | LookupName(Found, S); |
John McCall | f36e02d | 2009-10-09 21:13:30 +0000 | [diff] [blame] | 426 | else if (ScopeLookupResult) |
| 427 | Found.addDecl(ScopeLookupResult); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 428 | |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 429 | ObjectTypeSearchedInScope = true; |
| 430 | } |
Douglas Gregor | ac7cbd8 | 2010-07-28 14:49:07 +0000 | [diff] [blame] | 431 | } else if (!isDependent) { |
| 432 | // Perform unqualified name lookup in the current scope. |
| 433 | LookupName(Found, S); |
| 434 | } |
| 435 | |
| 436 | // If we performed lookup into a dependent context and did not find anything, |
| 437 | // that's fine: just build a dependent nested-name-specifier. |
| 438 | if (Found.empty() && isDependent && |
| 439 | !(LookupCtx && LookupCtx->isRecord() && |
| 440 | (!cast<CXXRecordDecl>(LookupCtx)->hasDefinition() || |
| 441 | !cast<CXXRecordDecl>(LookupCtx)->hasAnyDependentBases()))) { |
Chris Lattner | 4664649 | 2009-12-07 01:36:53 +0000 | [diff] [blame] | 442 | // Don't speculate if we're just trying to improve error recovery. |
| 443 | if (ErrorRecoveryLookup) |
Douglas Gregor | 2e4c34a | 2011-02-24 00:17:56 +0000 | [diff] [blame^] | 444 | return true; |
Chris Lattner | 4664649 | 2009-12-07 01:36:53 +0000 | [diff] [blame] | 445 | |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 446 | // We were not able to compute the declaration context for a dependent |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 447 | // base object type or prior nested-name-specifier, so this |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 448 | // nested-name-specifier refers to an unknown specialization. Just build |
| 449 | // a dependent nested-name-specifier. |
Douglas Gregor | 2e4c34a | 2011-02-24 00:17:56 +0000 | [diff] [blame^] | 450 | SS.Extend(Context, &Identifier, IdentifierLoc, CCLoc); |
| 451 | return false; |
Douglas Gregor | ac7cbd8 | 2010-07-28 14:49:07 +0000 | [diff] [blame] | 452 | } |
| 453 | |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 454 | // FIXME: Deal with ambiguities cleanly. |
Douglas Gregor | 175a656 | 2009-12-31 08:26:35 +0000 | [diff] [blame] | 455 | |
| 456 | if (Found.empty() && !ErrorRecoveryLookup) { |
| 457 | // We haven't found anything, and we're not recovering from a |
| 458 | // different kind of error, so look for typos. |
| 459 | DeclarationName Name = Found.getLookupName(); |
Douglas Gregor | aaf8716 | 2010-04-14 20:04:41 +0000 | [diff] [blame] | 460 | if (CorrectTypo(Found, S, &SS, LookupCtx, EnteringContext, |
| 461 | CTC_NoKeywords) && |
Douglas Gregor | 175a656 | 2009-12-31 08:26:35 +0000 | [diff] [blame] | 462 | Found.isSingleResult() && |
Douglas Gregor | edc9050 | 2010-02-25 04:46:04 +0000 | [diff] [blame] | 463 | isAcceptableNestedNameSpecifier(Found.getAsSingle<NamedDecl>())) { |
Douglas Gregor | 175a656 | 2009-12-31 08:26:35 +0000 | [diff] [blame] | 464 | if (LookupCtx) |
| 465 | Diag(Found.getNameLoc(), diag::err_no_member_suggest) |
| 466 | << Name << LookupCtx << Found.getLookupName() << SS.getRange() |
Douglas Gregor | 849b243 | 2010-03-31 17:46:05 +0000 | [diff] [blame] | 467 | << FixItHint::CreateReplacement(Found.getNameLoc(), |
| 468 | Found.getLookupName().getAsString()); |
Douglas Gregor | 175a656 | 2009-12-31 08:26:35 +0000 | [diff] [blame] | 469 | else |
| 470 | Diag(Found.getNameLoc(), diag::err_undeclared_var_use_suggest) |
| 471 | << Name << Found.getLookupName() |
Douglas Gregor | 849b243 | 2010-03-31 17:46:05 +0000 | [diff] [blame] | 472 | << FixItHint::CreateReplacement(Found.getNameLoc(), |
| 473 | Found.getLookupName().getAsString()); |
Douglas Gregor | 67dd1d4 | 2010-01-07 00:17:44 +0000 | [diff] [blame] | 474 | |
| 475 | if (NamedDecl *ND = Found.getAsSingle<NamedDecl>()) |
| 476 | Diag(ND->getLocation(), diag::note_previous_decl) |
| 477 | << ND->getDeclName(); |
Douglas Gregor | 12eb5d6 | 2010-06-29 19:27:42 +0000 | [diff] [blame] | 478 | } else { |
Douglas Gregor | 175a656 | 2009-12-31 08:26:35 +0000 | [diff] [blame] | 479 | Found.clear(); |
Douglas Gregor | 2e4c34a | 2011-02-24 00:17:56 +0000 | [diff] [blame^] | 480 | Found.setLookupName(&Identifier); |
Douglas Gregor | 12eb5d6 | 2010-06-29 19:27:42 +0000 | [diff] [blame] | 481 | } |
Douglas Gregor | 175a656 | 2009-12-31 08:26:35 +0000 | [diff] [blame] | 482 | } |
| 483 | |
John McCall | 1bcee0a | 2009-12-02 08:25:40 +0000 | [diff] [blame] | 484 | NamedDecl *SD = Found.getAsSingle<NamedDecl>(); |
Douglas Gregor | edc9050 | 2010-02-25 04:46:04 +0000 | [diff] [blame] | 485 | if (isAcceptableNestedNameSpecifier(SD)) { |
Douglas Gregor | c68afe2 | 2009-09-03 21:38:09 +0000 | [diff] [blame] | 486 | if (!ObjectType.isNull() && !ObjectTypeSearchedInScope) { |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 487 | // C++ [basic.lookup.classref]p4: |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 488 | // [...] If the name is found in both contexts, the |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 489 | // class-name-or-namespace-name shall refer to the same entity. |
| 490 | // |
| 491 | // We already found the name in the scope of the object. Now, look |
| 492 | // into the current scope (the scope of the postfix-expression) to |
Douglas Gregor | c68afe2 | 2009-09-03 21:38:09 +0000 | [diff] [blame] | 493 | // see if we can find the same name there. As above, if there is no |
| 494 | // scope, reconstruct the result from the template instantiation itself. |
John McCall | f36e02d | 2009-10-09 21:13:30 +0000 | [diff] [blame] | 495 | NamedDecl *OuterDecl; |
| 496 | if (S) { |
Douglas Gregor | 2e4c34a | 2011-02-24 00:17:56 +0000 | [diff] [blame^] | 497 | LookupResult FoundOuter(*this, &Identifier, IdentifierLoc, |
| 498 | LookupNestedNameSpecifierName); |
John McCall | a24dc2e | 2009-11-17 02:14:36 +0000 | [diff] [blame] | 499 | LookupName(FoundOuter, S); |
John McCall | 1bcee0a | 2009-12-02 08:25:40 +0000 | [diff] [blame] | 500 | OuterDecl = FoundOuter.getAsSingle<NamedDecl>(); |
John McCall | f36e02d | 2009-10-09 21:13:30 +0000 | [diff] [blame] | 501 | } else |
| 502 | OuterDecl = ScopeLookupResult; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 503 | |
Douglas Gregor | edc9050 | 2010-02-25 04:46:04 +0000 | [diff] [blame] | 504 | if (isAcceptableNestedNameSpecifier(OuterDecl) && |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 505 | OuterDecl->getCanonicalDecl() != SD->getCanonicalDecl() && |
| 506 | (!isa<TypeDecl>(OuterDecl) || !isa<TypeDecl>(SD) || |
| 507 | !Context.hasSameType( |
Douglas Gregor | c68afe2 | 2009-09-03 21:38:09 +0000 | [diff] [blame] | 508 | Context.getTypeDeclType(cast<TypeDecl>(OuterDecl)), |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 509 | Context.getTypeDeclType(cast<TypeDecl>(SD))))) { |
Douglas Gregor | 2e4c34a | 2011-02-24 00:17:56 +0000 | [diff] [blame^] | 510 | if (ErrorRecoveryLookup) |
| 511 | return true; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 512 | |
Douglas Gregor | 2e4c34a | 2011-02-24 00:17:56 +0000 | [diff] [blame^] | 513 | Diag(IdentifierLoc, |
| 514 | diag::err_nested_name_member_ref_lookup_ambiguous) |
| 515 | << &Identifier; |
| 516 | Diag(SD->getLocation(), diag::note_ambig_member_ref_object_type) |
| 517 | << ObjectType; |
| 518 | Diag(OuterDecl->getLocation(), diag::note_ambig_member_ref_scope); |
| 519 | |
| 520 | // Fall through so that we'll pick the name we found in the object |
| 521 | // type, since that's probably what the user wanted anyway. |
| 522 | } |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 523 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 524 | |
Douglas Gregor | 2e4c34a | 2011-02-24 00:17:56 +0000 | [diff] [blame^] | 525 | // If we're just performing this lookup for error-recovery purposes, |
| 526 | // don't extend the nested-name-specifier. Just return now. |
| 527 | if (ErrorRecoveryLookup) |
| 528 | return false; |
| 529 | |
| 530 | if (NamespaceDecl *Namespace = dyn_cast<NamespaceDecl>(SD)) { |
| 531 | SS.Extend(Context, Namespace, IdentifierLoc, CCLoc); |
| 532 | return false; |
| 533 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 534 | |
Douglas Gregor | dacd434 | 2009-08-26 00:04:55 +0000 | [diff] [blame] | 535 | // FIXME: It would be nice to maintain the namespace alias name, then |
| 536 | // see through that alias when resolving the nested-name-specifier down to |
| 537 | // a declaration context. |
Douglas Gregor | 2e4c34a | 2011-02-24 00:17:56 +0000 | [diff] [blame^] | 538 | if (NamespaceAliasDecl *Alias = dyn_cast<NamespaceAliasDecl>(SD)) { |
| 539 | SS.Extend(Context, Alias->getNamespace(), IdentifierLoc, CCLoc); |
| 540 | return false; |
| 541 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 542 | |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 543 | QualType T = Context.getTypeDeclType(cast<TypeDecl>(SD)); |
Douglas Gregor | 2e4c34a | 2011-02-24 00:17:56 +0000 | [diff] [blame^] | 544 | TypeLocBuilder TLB; |
| 545 | if (isa<InjectedClassNameType>(T)) { |
| 546 | InjectedClassNameTypeLoc InjectedTL |
| 547 | = TLB.push<InjectedClassNameTypeLoc>(T); |
| 548 | InjectedTL.setNameLoc(IdentifierLoc); |
| 549 | } else if (isa<RecordDecl>(SD)) { |
| 550 | RecordTypeLoc RecordTL = TLB.push<RecordTypeLoc>(T); |
| 551 | RecordTL.setNameLoc(IdentifierLoc); |
| 552 | } else if (isa<TypedefDecl>(SD)) { |
| 553 | TypedefTypeLoc TypedefTL = TLB.push<TypedefTypeLoc>(T); |
| 554 | TypedefTL.setNameLoc(IdentifierLoc); |
| 555 | } else if (isa<EnumDecl>(SD)) { |
| 556 | EnumTypeLoc EnumTL = TLB.push<EnumTypeLoc>(T); |
| 557 | EnumTL.setNameLoc(IdentifierLoc); |
| 558 | } else if (isa<TemplateTypeParmDecl>(SD)) { |
| 559 | TemplateTypeParmTypeLoc TemplateTypeTL |
| 560 | = TLB.push<TemplateTypeParmTypeLoc>(T); |
| 561 | TemplateTypeTL.setNameLoc(IdentifierLoc); |
| 562 | } else { |
| 563 | assert(isa<UnresolvedUsingTypenameDecl>(SD) && |
| 564 | "Unhandled TypeDecl node in nested-name-specifier"); |
| 565 | UnresolvedUsingTypeLoc UnresolvedTL |
| 566 | = TLB.push<UnresolvedUsingTypeLoc>(T); |
| 567 | UnresolvedTL.setNameLoc(IdentifierLoc); |
| 568 | } |
| 569 | |
| 570 | SS.Extend(Context, SourceLocation(), TLB.getTypeLocInContext(Context, T), |
| 571 | CCLoc); |
| 572 | return false; |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 573 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 574 | |
Chris Lattner | 4664649 | 2009-12-07 01:36:53 +0000 | [diff] [blame] | 575 | // Otherwise, we have an error case. If we don't want diagnostics, just |
| 576 | // return an error now. |
| 577 | if (ErrorRecoveryLookup) |
Douglas Gregor | 2e4c34a | 2011-02-24 00:17:56 +0000 | [diff] [blame^] | 578 | return true; |
Chris Lattner | 4664649 | 2009-12-07 01:36:53 +0000 | [diff] [blame] | 579 | |
Cedric Venet | 3d65864 | 2009-02-14 20:20:19 +0000 | [diff] [blame] | 580 | // If we didn't find anything during our lookup, try again with |
| 581 | // ordinary name lookup, which can help us produce better error |
| 582 | // messages. |
John McCall | 1bcee0a | 2009-12-02 08:25:40 +0000 | [diff] [blame] | 583 | if (Found.empty()) { |
John McCall | a24dc2e | 2009-11-17 02:14:36 +0000 | [diff] [blame] | 584 | Found.clear(LookupOrdinaryName); |
| 585 | LookupName(Found, S); |
John McCall | f36e02d | 2009-10-09 21:13:30 +0000 | [diff] [blame] | 586 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 587 | |
Cedric Venet | 3d65864 | 2009-02-14 20:20:19 +0000 | [diff] [blame] | 588 | unsigned DiagID; |
John McCall | 1bcee0a | 2009-12-02 08:25:40 +0000 | [diff] [blame] | 589 | if (!Found.empty()) |
Cedric Venet | 3d65864 | 2009-02-14 20:20:19 +0000 | [diff] [blame] | 590 | DiagID = diag::err_expected_class_or_namespace; |
Anders Carlsson | a31d5f7 | 2009-08-30 07:09:50 +0000 | [diff] [blame] | 591 | else if (SS.isSet()) { |
Douglas Gregor | 2e4c34a | 2011-02-24 00:17:56 +0000 | [diff] [blame^] | 592 | Diag(IdentifierLoc, diag::err_no_member) |
| 593 | << &Identifier << LookupCtx << SS.getRange(); |
| 594 | return true; |
Anders Carlsson | a31d5f7 | 2009-08-30 07:09:50 +0000 | [diff] [blame] | 595 | } else |
Cedric Venet | 3d65864 | 2009-02-14 20:20:19 +0000 | [diff] [blame] | 596 | DiagID = diag::err_undeclared_var_use; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 597 | |
Cedric Venet | 3d65864 | 2009-02-14 20:20:19 +0000 | [diff] [blame] | 598 | if (SS.isSet()) |
Douglas Gregor | 2e4c34a | 2011-02-24 00:17:56 +0000 | [diff] [blame^] | 599 | Diag(IdentifierLoc, DiagID) << &Identifier << SS.getRange(); |
Cedric Venet | 3d65864 | 2009-02-14 20:20:19 +0000 | [diff] [blame] | 600 | else |
Douglas Gregor | 2e4c34a | 2011-02-24 00:17:56 +0000 | [diff] [blame^] | 601 | Diag(IdentifierLoc, DiagID) << &Identifier; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 602 | |
Douglas Gregor | 2e4c34a | 2011-02-24 00:17:56 +0000 | [diff] [blame^] | 603 | return true; |
Cedric Venet | 3d65864 | 2009-02-14 20:20:19 +0000 | [diff] [blame] | 604 | } |
| 605 | |
Douglas Gregor | 2e4c34a | 2011-02-24 00:17:56 +0000 | [diff] [blame^] | 606 | bool Sema::ActOnCXXNestedNameSpecifier(Scope *S, |
| 607 | IdentifierInfo &Identifier, |
| 608 | SourceLocation IdentifierLoc, |
| 609 | SourceLocation CCLoc, |
| 610 | ParsedType ObjectType, |
| 611 | bool EnteringContext, |
| 612 | CXXScopeSpec &SS) { |
| 613 | if (SS.isInvalid()) |
| 614 | return true; |
| 615 | |
| 616 | return BuildCXXNestedNameSpecifier(S, Identifier, IdentifierLoc, CCLoc, |
| 617 | GetTypeFromParser(ObjectType), |
| 618 | EnteringContext, SS, |
| 619 | /*ScopeLookupResult=*/0, false); |
Chris Lattner | 4664649 | 2009-12-07 01:36:53 +0000 | [diff] [blame] | 620 | } |
| 621 | |
| 622 | /// IsInvalidUnlessNestedName - This method is used for error recovery |
| 623 | /// purposes to determine whether the specified identifier is only valid as |
| 624 | /// a nested name specifier, for example a namespace name. It is |
| 625 | /// conservatively correct to always return false from this method. |
| 626 | /// |
| 627 | /// The arguments are the same as those passed to ActOnCXXNestedNameSpecifier. |
Jeffrey Yasskin | 9ab1454 | 2010-04-08 16:38:48 +0000 | [diff] [blame] | 628 | bool Sema::IsInvalidUnlessNestedName(Scope *S, CXXScopeSpec &SS, |
Douglas Gregor | 2e4c34a | 2011-02-24 00:17:56 +0000 | [diff] [blame^] | 629 | IdentifierInfo &Identifier, |
| 630 | SourceLocation IdentifierLoc, |
| 631 | SourceLocation ColonLoc, |
| 632 | ParsedType ObjectType, |
Chris Lattner | 4664649 | 2009-12-07 01:36:53 +0000 | [diff] [blame] | 633 | bool EnteringContext) { |
Douglas Gregor | 2e4c34a | 2011-02-24 00:17:56 +0000 | [diff] [blame^] | 634 | if (SS.isInvalid()) |
| 635 | return false; |
| 636 | |
| 637 | return !BuildCXXNestedNameSpecifier(S, Identifier, IdentifierLoc, ColonLoc, |
| 638 | GetTypeFromParser(ObjectType), |
| 639 | EnteringContext, SS, |
| 640 | /*ScopeLookupResult=*/0, true); |
Douglas Gregor | c68afe2 | 2009-09-03 21:38:09 +0000 | [diff] [blame] | 641 | } |
| 642 | |
Douglas Gregor | 2e4c34a | 2011-02-24 00:17:56 +0000 | [diff] [blame^] | 643 | bool Sema::ActOnCXXNestedNameSpecifier(Scope *S, |
| 644 | ParsedType Type, |
| 645 | SourceLocation CCLoc, |
| 646 | CXXScopeSpec &SS) { |
| 647 | if (SS.isInvalid()) |
| 648 | return true; |
| 649 | |
| 650 | TypeSourceInfo *TSInfo; |
| 651 | QualType T = GetTypeFromParser(Type, &TSInfo); |
| 652 | if (T.isNull()) |
| 653 | return true; |
| 654 | |
| 655 | assert(TSInfo && "Not TypeSourceInfo in nested-name-specifier?"); |
| 656 | // FIXME: location of the 'template' keyword? |
| 657 | SS.Extend(Context, SourceLocation(), TSInfo->getTypeLoc(), CCLoc); |
| 658 | return false; |
Douglas Gregor | 39a8de1 | 2009-02-25 19:37:18 +0000 | [diff] [blame] | 659 | } |
| 660 | |
John McCall | e7e278b | 2009-12-11 20:04:54 +0000 | [diff] [blame] | 661 | bool Sema::ShouldEnterDeclaratorScope(Scope *S, const CXXScopeSpec &SS) { |
| 662 | assert(SS.isSet() && "Parser passed invalid CXXScopeSpec."); |
| 663 | |
| 664 | NestedNameSpecifier *Qualifier = |
| 665 | static_cast<NestedNameSpecifier*>(SS.getScopeRep()); |
| 666 | |
| 667 | // There are only two places a well-formed program may qualify a |
| 668 | // declarator: first, when defining a namespace or class member |
| 669 | // out-of-line, and second, when naming an explicitly-qualified |
| 670 | // friend function. The latter case is governed by |
| 671 | // C++03 [basic.lookup.unqual]p10: |
| 672 | // In a friend declaration naming a member function, a name used |
| 673 | // in the function declarator and not part of a template-argument |
| 674 | // in a template-id is first looked up in the scope of the member |
| 675 | // function's class. If it is not found, or if the name is part of |
| 676 | // a template-argument in a template-id, the look up is as |
| 677 | // described for unqualified names in the definition of the class |
| 678 | // granting friendship. |
| 679 | // i.e. we don't push a scope unless it's a class member. |
| 680 | |
| 681 | switch (Qualifier->getKind()) { |
| 682 | case NestedNameSpecifier::Global: |
| 683 | case NestedNameSpecifier::Namespace: |
| 684 | // These are always namespace scopes. We never want to enter a |
| 685 | // namespace scope from anything but a file context. |
Sebastian Redl | 7a126a4 | 2010-08-31 00:36:30 +0000 | [diff] [blame] | 686 | return CurContext->getRedeclContext()->isFileContext(); |
John McCall | e7e278b | 2009-12-11 20:04:54 +0000 | [diff] [blame] | 687 | |
| 688 | case NestedNameSpecifier::Identifier: |
| 689 | case NestedNameSpecifier::TypeSpec: |
| 690 | case NestedNameSpecifier::TypeSpecWithTemplate: |
| 691 | // These are never namespace scopes. |
| 692 | return true; |
| 693 | } |
| 694 | |
| 695 | // Silence bogus warning. |
| 696 | return false; |
| 697 | } |
| 698 | |
Cedric Venet | 3d65864 | 2009-02-14 20:20:19 +0000 | [diff] [blame] | 699 | /// ActOnCXXEnterDeclaratorScope - Called when a C++ scope specifier (global |
| 700 | /// scope or nested-name-specifier) is parsed, part of a declarator-id. |
| 701 | /// After this method is called, according to [C++ 3.4.3p3], names should be |
| 702 | /// looked up in the declarator-id's scope, until the declarator is parsed and |
| 703 | /// ActOnCXXExitDeclaratorScope is called. |
| 704 | /// The 'SS' should be a non-empty valid CXXScopeSpec. |
Jeffrey Yasskin | 9ab1454 | 2010-04-08 16:38:48 +0000 | [diff] [blame] | 705 | bool Sema::ActOnCXXEnterDeclaratorScope(Scope *S, CXXScopeSpec &SS) { |
Cedric Venet | 3d65864 | 2009-02-14 20:20:19 +0000 | [diff] [blame] | 706 | assert(SS.isSet() && "Parser passed invalid CXXScopeSpec."); |
John McCall | 7a1dc56 | 2009-12-19 10:49:29 +0000 | [diff] [blame] | 707 | |
| 708 | if (SS.isInvalid()) return true; |
| 709 | |
| 710 | DeclContext *DC = computeDeclContext(SS, true); |
| 711 | if (!DC) return true; |
| 712 | |
| 713 | // Before we enter a declarator's context, we need to make sure that |
| 714 | // it is a complete declaration context. |
John McCall | 77bb1aa | 2010-05-01 00:40:08 +0000 | [diff] [blame] | 715 | if (!DC->isDependentContext() && RequireCompleteDeclContext(SS, DC)) |
John McCall | 7a1dc56 | 2009-12-19 10:49:29 +0000 | [diff] [blame] | 716 | return true; |
| 717 | |
| 718 | EnterDeclaratorContext(S, DC); |
John McCall | 31f17ec | 2010-04-27 00:57:59 +0000 | [diff] [blame] | 719 | |
| 720 | // Rebuild the nested name specifier for the new scope. |
| 721 | if (DC->isDependentContext()) |
| 722 | RebuildNestedNameSpecifierInCurrentInstantiation(SS); |
| 723 | |
Douglas Gregor | 7dfd0fb | 2009-09-24 23:39:01 +0000 | [diff] [blame] | 724 | return false; |
Cedric Venet | 3d65864 | 2009-02-14 20:20:19 +0000 | [diff] [blame] | 725 | } |
| 726 | |
| 727 | /// ActOnCXXExitDeclaratorScope - Called when a declarator that previously |
| 728 | /// invoked ActOnCXXEnterDeclaratorScope(), is finished. 'SS' is the same |
| 729 | /// CXXScopeSpec that was passed to ActOnCXXEnterDeclaratorScope as well. |
| 730 | /// Used to indicate that names should revert to being looked up in the |
| 731 | /// defining scope. |
| 732 | void Sema::ActOnCXXExitDeclaratorScope(Scope *S, const CXXScopeSpec &SS) { |
| 733 | assert(SS.isSet() && "Parser passed invalid CXXScopeSpec."); |
Douglas Gregor | dacd434 | 2009-08-26 00:04:55 +0000 | [diff] [blame] | 734 | if (SS.isInvalid()) |
| 735 | return; |
John McCall | 7a1dc56 | 2009-12-19 10:49:29 +0000 | [diff] [blame] | 736 | assert(!SS.isInvalid() && computeDeclContext(SS, true) && |
| 737 | "exiting declarator scope we never really entered"); |
| 738 | ExitDeclaratorContext(S); |
Cedric Venet | 3d65864 | 2009-02-14 20:20:19 +0000 | [diff] [blame] | 739 | } |