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 | |
Douglas Gregor | 14aba76 | 2011-02-24 02:36:08 +0000 | [diff] [blame] | 142 | case NestedNameSpecifier::NamespaceAlias: |
| 143 | return NNS->getAsNamespaceAlias()->getNamespace(); |
| 144 | |
Douglas Gregor | ab452ba | 2009-03-26 23:50:42 +0000 | [diff] [blame] | 145 | case NestedNameSpecifier::TypeSpec: |
| 146 | case NestedNameSpecifier::TypeSpecWithTemplate: { |
Douglas Gregor | edc9050 | 2010-02-25 04:46:04 +0000 | [diff] [blame] | 147 | const TagType *Tag = NNS->getAsType()->getAs<TagType>(); |
| 148 | assert(Tag && "Non-tag type in nested-name-specifier"); |
| 149 | return Tag->getDecl(); |
| 150 | } break; |
Douglas Gregor | ab452ba | 2009-03-26 23:50:42 +0000 | [diff] [blame] | 151 | |
| 152 | case NestedNameSpecifier::Global: |
| 153 | return Context.getTranslationUnitDecl(); |
| 154 | } |
| 155 | |
Douglas Gregor | edc9050 | 2010-02-25 04:46:04 +0000 | [diff] [blame] | 156 | // Required to silence a GCC warning. |
Douglas Gregor | ab452ba | 2009-03-26 23:50:42 +0000 | [diff] [blame] | 157 | return 0; |
Douglas Gregor | ca5e77f | 2009-03-18 00:36:05 +0000 | [diff] [blame] | 158 | } |
| 159 | |
Douglas Gregor | 5953d8b | 2009-03-19 17:26:29 +0000 | [diff] [blame] | 160 | bool Sema::isDependentScopeSpecifier(const CXXScopeSpec &SS) { |
| 161 | if (!SS.isSet() || SS.isInvalid()) |
| 162 | return false; |
| 163 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 164 | NestedNameSpecifier *NNS |
Douglas Gregor | 3507369 | 2009-03-26 23:56:24 +0000 | [diff] [blame] | 165 | = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); |
Douglas Gregor | ab452ba | 2009-03-26 23:50:42 +0000 | [diff] [blame] | 166 | return NNS->isDependent(); |
Douglas Gregor | 5953d8b | 2009-03-19 17:26:29 +0000 | [diff] [blame] | 167 | } |
| 168 | |
Douglas Gregor | 42af25f | 2009-05-11 19:58:34 +0000 | [diff] [blame] | 169 | // \brief Determine whether this C++ scope specifier refers to an |
| 170 | // unknown specialization, i.e., a dependent type that is not the |
| 171 | // current instantiation. |
| 172 | bool Sema::isUnknownSpecialization(const CXXScopeSpec &SS) { |
| 173 | if (!isDependentScopeSpecifier(SS)) |
| 174 | return false; |
| 175 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 176 | NestedNameSpecifier *NNS |
Douglas Gregor | 42af25f | 2009-05-11 19:58:34 +0000 | [diff] [blame] | 177 | = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); |
| 178 | return getCurrentInstantiationOf(NNS) == 0; |
| 179 | } |
| 180 | |
| 181 | /// \brief If the given nested name specifier refers to the current |
| 182 | /// instantiation, return the declaration that corresponds to that |
| 183 | /// current instantiation (C++0x [temp.dep.type]p1). |
| 184 | /// |
| 185 | /// \param NNS a dependent nested name specifier. |
| 186 | CXXRecordDecl *Sema::getCurrentInstantiationOf(NestedNameSpecifier *NNS) { |
| 187 | assert(getLangOptions().CPlusPlus && "Only callable in C++"); |
| 188 | assert(NNS->isDependent() && "Only dependent nested-name-specifier allowed"); |
| 189 | |
Douglas Gregor | f59a56e | 2009-07-21 23:53:31 +0000 | [diff] [blame] | 190 | if (!NNS->getAsType()) |
| 191 | return 0; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 192 | |
Douglas Gregor | 1560def | 2009-07-31 18:32:42 +0000 | [diff] [blame] | 193 | QualType T = QualType(NNS->getAsType(), 0); |
Douglas Gregor | d9ea180 | 2011-02-19 19:24:40 +0000 | [diff] [blame] | 194 | return ::getCurrentInstantiationOf(T, CurContext); |
Douglas Gregor | 42af25f | 2009-05-11 19:58:34 +0000 | [diff] [blame] | 195 | } |
| 196 | |
Douglas Gregor | 4fdf1fa | 2009-03-11 16:48:53 +0000 | [diff] [blame] | 197 | /// \brief Require that the context specified by SS be complete. |
| 198 | /// |
| 199 | /// If SS refers to a type, this routine checks whether the type is |
| 200 | /// complete enough (or can be made complete enough) for name lookup |
| 201 | /// into the DeclContext. A type that is not yet completed can be |
| 202 | /// considered "complete enough" if it is a class/struct/union/enum |
| 203 | /// that is currently being defined. Or, if we have a type that names |
| 204 | /// a class template specialization that is not a complete type, we |
| 205 | /// will attempt to instantiate that class template. |
John McCall | 77bb1aa | 2010-05-01 00:40:08 +0000 | [diff] [blame] | 206 | bool Sema::RequireCompleteDeclContext(CXXScopeSpec &SS, |
| 207 | DeclContext *DC) { |
| 208 | assert(DC != 0 && "given null context"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 209 | |
Douglas Gregor | 4fdf1fa | 2009-03-11 16:48:53 +0000 | [diff] [blame] | 210 | if (TagDecl *Tag = dyn_cast<TagDecl>(DC)) { |
Douglas Gregor | a4e8c2a | 2010-02-05 04:39:02 +0000 | [diff] [blame] | 211 | // If this is a dependent type, then we consider it complete. |
| 212 | if (Tag->isDependentContext()) |
| 213 | return false; |
| 214 | |
Douglas Gregor | 4fdf1fa | 2009-03-11 16:48:53 +0000 | [diff] [blame] | 215 | // If we're currently defining this type, then lookup into the |
| 216 | // type is okay: don't complain that it isn't complete yet. |
Ted Kremenek | 6217b80 | 2009-07-29 21:53:49 +0000 | [diff] [blame] | 217 | const TagType *TagT = Context.getTypeDeclType(Tag)->getAs<TagType>(); |
John McCall | 3cb0ebd | 2010-03-10 03:28:59 +0000 | [diff] [blame] | 218 | if (TagT && TagT->isBeingDefined()) |
Douglas Gregor | 4fdf1fa | 2009-03-11 16:48:53 +0000 | [diff] [blame] | 219 | return false; |
| 220 | |
| 221 | // The type must be complete. |
Jeffrey Yasskin | 9ab1454 | 2010-04-08 16:38:48 +0000 | [diff] [blame] | 222 | if (RequireCompleteType(SS.getRange().getBegin(), |
| 223 | Context.getTypeDeclType(Tag), |
| 224 | PDiag(diag::err_incomplete_nested_name_spec) |
John McCall | 77bb1aa | 2010-05-01 00:40:08 +0000 | [diff] [blame] | 225 | << SS.getRange())) { |
Douglas Gregor | 2e4c34a | 2011-02-24 00:17:56 +0000 | [diff] [blame] | 226 | SS.SetInvalid(SS.getRange()); |
Jeffrey Yasskin | 9ab1454 | 2010-04-08 16:38:48 +0000 | [diff] [blame] | 227 | return true; |
| 228 | } |
Douglas Gregor | 4fdf1fa | 2009-03-11 16:48:53 +0000 | [diff] [blame] | 229 | } |
| 230 | |
| 231 | return false; |
| 232 | } |
Cedric Venet | 3d65864 | 2009-02-14 20:20:19 +0000 | [diff] [blame] | 233 | |
Douglas Gregor | 2e4c34a | 2011-02-24 00:17:56 +0000 | [diff] [blame] | 234 | bool Sema::ActOnCXXGlobalScopeSpecifier(Scope *S, SourceLocation CCLoc, |
| 235 | CXXScopeSpec &SS) { |
| 236 | SS.MakeGlobal(Context, CCLoc); |
| 237 | return false; |
Cedric Venet | 3d65864 | 2009-02-14 20:20:19 +0000 | [diff] [blame] | 238 | } |
| 239 | |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 240 | /// \brief Determines whether the given declaration is an valid acceptable |
| 241 | /// result for name lookup of a nested-name-specifier. |
Douglas Gregor | edc9050 | 2010-02-25 04:46:04 +0000 | [diff] [blame] | 242 | bool Sema::isAcceptableNestedNameSpecifier(NamedDecl *SD) { |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 243 | if (!SD) |
| 244 | return false; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 245 | |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 246 | // Namespace and namespace aliases are fine. |
| 247 | if (isa<NamespaceDecl>(SD) || isa<NamespaceAliasDecl>(SD)) |
| 248 | return true; |
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 | if (!isa<TypeDecl>(SD)) |
| 251 | return false; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 252 | |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 253 | // Determine whether we have a class (or, in C++0x, an enum) or |
| 254 | // a typedef thereof. If so, build the nested-name-specifier. |
| 255 | QualType T = Context.getTypeDeclType(cast<TypeDecl>(SD)); |
| 256 | if (T->isDependentType()) |
| 257 | return true; |
| 258 | else if (TypedefDecl *TD = dyn_cast<TypedefDecl>(SD)) { |
| 259 | if (TD->getUnderlyingType()->isRecordType() || |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 260 | (Context.getLangOptions().CPlusPlus0x && |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 261 | TD->getUnderlyingType()->isEnumeralType())) |
| 262 | return true; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 263 | } else if (isa<RecordDecl>(SD) || |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 264 | (Context.getLangOptions().CPlusPlus0x && isa<EnumDecl>(SD))) |
| 265 | return true; |
| 266 | |
| 267 | return false; |
| 268 | } |
| 269 | |
Douglas Gregor | c68afe2 | 2009-09-03 21:38:09 +0000 | [diff] [blame] | 270 | /// \brief If the given nested-name-specifier begins with a bare identifier |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 271 | /// (e.g., Base::), perform name lookup for that identifier as a |
Douglas Gregor | c68afe2 | 2009-09-03 21:38:09 +0000 | [diff] [blame] | 272 | /// nested-name-specifier within the given scope, and return the result of that |
| 273 | /// name lookup. |
| 274 | NamedDecl *Sema::FindFirstQualifierInScope(Scope *S, NestedNameSpecifier *NNS) { |
| 275 | if (!S || !NNS) |
| 276 | return 0; |
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 | while (NNS->getPrefix()) |
| 279 | NNS = NNS->getPrefix(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 280 | |
Douglas Gregor | c68afe2 | 2009-09-03 21:38:09 +0000 | [diff] [blame] | 281 | if (NNS->getKind() != NestedNameSpecifier::Identifier) |
| 282 | return 0; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 283 | |
John McCall | a24dc2e | 2009-11-17 02:14:36 +0000 | [diff] [blame] | 284 | LookupResult Found(*this, NNS->getAsIdentifier(), SourceLocation(), |
| 285 | LookupNestedNameSpecifierName); |
| 286 | LookupName(Found, S); |
Douglas Gregor | c68afe2 | 2009-09-03 21:38:09 +0000 | [diff] [blame] | 287 | assert(!Found.isAmbiguous() && "Cannot handle ambiguities here yet"); |
| 288 | |
John McCall | 1bcee0a | 2009-12-02 08:25:40 +0000 | [diff] [blame] | 289 | if (!Found.isSingleResult()) |
| 290 | return 0; |
| 291 | |
| 292 | NamedDecl *Result = Found.getFoundDecl(); |
Douglas Gregor | edc9050 | 2010-02-25 04:46:04 +0000 | [diff] [blame] | 293 | if (isAcceptableNestedNameSpecifier(Result)) |
Douglas Gregor | c68afe2 | 2009-09-03 21:38:09 +0000 | [diff] [blame] | 294 | return Result; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 295 | |
Douglas Gregor | c68afe2 | 2009-09-03 21:38:09 +0000 | [diff] [blame] | 296 | return 0; |
| 297 | } |
| 298 | |
Jeffrey Yasskin | 9ab1454 | 2010-04-08 16:38:48 +0000 | [diff] [blame] | 299 | bool Sema::isNonTypeNestedNameSpecifier(Scope *S, CXXScopeSpec &SS, |
Douglas Gregor | 7754908 | 2010-02-24 21:29:12 +0000 | [diff] [blame] | 300 | SourceLocation IdLoc, |
| 301 | IdentifierInfo &II, |
John McCall | b3d8748 | 2010-08-24 05:47:05 +0000 | [diff] [blame] | 302 | ParsedType ObjectTypePtr) { |
Douglas Gregor | 7754908 | 2010-02-24 21:29:12 +0000 | [diff] [blame] | 303 | QualType ObjectType = GetTypeFromParser(ObjectTypePtr); |
| 304 | LookupResult Found(*this, &II, IdLoc, LookupNestedNameSpecifierName); |
| 305 | |
| 306 | // Determine where to perform name lookup |
| 307 | DeclContext *LookupCtx = 0; |
| 308 | bool isDependent = false; |
| 309 | if (!ObjectType.isNull()) { |
| 310 | // This nested-name-specifier occurs in a member access expression, e.g., |
| 311 | // x->B::f, and we are looking into the type of the object. |
| 312 | assert(!SS.isSet() && "ObjectType and scope specifier cannot coexist"); |
| 313 | LookupCtx = computeDeclContext(ObjectType); |
| 314 | isDependent = ObjectType->isDependentType(); |
| 315 | } else if (SS.isSet()) { |
| 316 | // This nested-name-specifier occurs after another nested-name-specifier, |
| 317 | // so long into the context associated with the prior nested-name-specifier. |
| 318 | LookupCtx = computeDeclContext(SS, false); |
| 319 | isDependent = isDependentScopeSpecifier(SS); |
| 320 | Found.setContextRange(SS.getRange()); |
| 321 | } |
| 322 | |
| 323 | if (LookupCtx) { |
| 324 | // Perform "qualified" name lookup into the declaration context we |
| 325 | // computed, which is either the type of the base of a member access |
| 326 | // expression or the declaration context associated with a prior |
| 327 | // nested-name-specifier. |
| 328 | |
| 329 | // The declaration context must be complete. |
John McCall | 77bb1aa | 2010-05-01 00:40:08 +0000 | [diff] [blame] | 330 | if (!LookupCtx->isDependentContext() && |
| 331 | RequireCompleteDeclContext(SS, LookupCtx)) |
Douglas Gregor | 7754908 | 2010-02-24 21:29:12 +0000 | [diff] [blame] | 332 | return false; |
| 333 | |
| 334 | LookupQualifiedName(Found, LookupCtx); |
| 335 | } else if (isDependent) { |
| 336 | return false; |
| 337 | } else { |
| 338 | LookupName(Found, S); |
| 339 | } |
| 340 | Found.suppressDiagnostics(); |
| 341 | |
| 342 | if (NamedDecl *ND = Found.getAsSingle<NamedDecl>()) |
| 343 | return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); |
| 344 | |
| 345 | return false; |
| 346 | } |
| 347 | |
Douglas Gregor | c68afe2 | 2009-09-03 21:38:09 +0000 | [diff] [blame] | 348 | /// \brief Build a new nested-name-specifier for "identifier::", as described |
| 349 | /// by ActOnCXXNestedNameSpecifier. |
| 350 | /// |
| 351 | /// This routine differs only slightly from ActOnCXXNestedNameSpecifier, in |
| 352 | /// that it contains an extra parameter \p ScopeLookupResult, which provides |
| 353 | /// 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] | 354 | /// that was computed at template definition time. |
Chris Lattner | 4664649 | 2009-12-07 01:36:53 +0000 | [diff] [blame] | 355 | /// |
| 356 | /// If ErrorRecoveryLookup is true, then this call is used to improve error |
| 357 | /// recovery. This means that it should not emit diagnostics, it should |
Douglas Gregor | 2e4c34a | 2011-02-24 00:17:56 +0000 | [diff] [blame] | 358 | /// 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] | 359 | /// 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] | 360 | /// dependent context, for example. Nor will it extend \p SS with the scope |
| 361 | /// specifier. |
| 362 | bool Sema::BuildCXXNestedNameSpecifier(Scope *S, |
| 363 | IdentifierInfo &Identifier, |
| 364 | SourceLocation IdentifierLoc, |
| 365 | SourceLocation CCLoc, |
| 366 | QualType ObjectType, |
| 367 | bool EnteringContext, |
| 368 | CXXScopeSpec &SS, |
| 369 | NamedDecl *ScopeLookupResult, |
| 370 | bool ErrorRecoveryLookup) { |
| 371 | LookupResult Found(*this, &Identifier, IdentifierLoc, |
| 372 | LookupNestedNameSpecifierName); |
John McCall | a24dc2e | 2009-11-17 02:14:36 +0000 | [diff] [blame] | 373 | |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 374 | // Determine where to perform name lookup |
| 375 | DeclContext *LookupCtx = 0; |
| 376 | bool isDependent = false; |
Douglas Gregor | c68afe2 | 2009-09-03 21:38:09 +0000 | [diff] [blame] | 377 | if (!ObjectType.isNull()) { |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 378 | // This nested-name-specifier occurs in a member access expression, e.g., |
| 379 | // x->B::f, and we are looking into the type of the object. |
| 380 | assert(!SS.isSet() && "ObjectType and scope specifier cannot coexist"); |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 381 | LookupCtx = computeDeclContext(ObjectType); |
| 382 | isDependent = ObjectType->isDependentType(); |
| 383 | } else if (SS.isSet()) { |
| 384 | // This nested-name-specifier occurs after another nested-name-specifier, |
| 385 | // so long into the context associated with the prior nested-name-specifier. |
| 386 | LookupCtx = computeDeclContext(SS, EnteringContext); |
| 387 | isDependent = isDependentScopeSpecifier(SS); |
John McCall | a24dc2e | 2009-11-17 02:14:36 +0000 | [diff] [blame] | 388 | Found.setContextRange(SS.getRange()); |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 389 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 390 | |
John McCall | a24dc2e | 2009-11-17 02:14:36 +0000 | [diff] [blame] | 391 | |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 392 | bool ObjectTypeSearchedInScope = false; |
| 393 | if (LookupCtx) { |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 394 | // Perform "qualified" name lookup into the declaration context we |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 395 | // 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] | 396 | // expression or the declaration context associated with a prior |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 397 | // nested-name-specifier. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 398 | |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 399 | // The declaration context must be complete. |
John McCall | 77bb1aa | 2010-05-01 00:40:08 +0000 | [diff] [blame] | 400 | if (!LookupCtx->isDependentContext() && |
| 401 | RequireCompleteDeclContext(SS, LookupCtx)) |
Douglas Gregor | 2e4c34a | 2011-02-24 00:17:56 +0000 | [diff] [blame] | 402 | return true; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 403 | |
John McCall | a24dc2e | 2009-11-17 02:14:36 +0000 | [diff] [blame] | 404 | LookupQualifiedName(Found, LookupCtx); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 405 | |
John McCall | a24dc2e | 2009-11-17 02:14:36 +0000 | [diff] [blame] | 406 | if (!ObjectType.isNull() && Found.empty()) { |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 407 | // C++ [basic.lookup.classref]p4: |
| 408 | // 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] | 409 | // the form |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 410 | // |
| 411 | // class-name-or-namespace-name::... |
| 412 | // |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 413 | // the class-name-or-namespace-name following the . or -> operator is |
| 414 | // 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] | 415 | // 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] | 416 | // only in the scope of the class of the object expression, the name |
| 417 | // 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] | 418 | // context of the entire postfix-expression, the name shall refer to a |
| 419 | // class-name or namespace-name. [...] |
| 420 | // |
| 421 | // Qualified name lookup into a class will not find a namespace-name, |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 422 | // so we do not need to diagnoste that case specifically. However, |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 423 | // this qualified name lookup may find nothing. In that case, perform |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 424 | // unqualified name lookup in the given scope (if available) or |
Douglas Gregor | c68afe2 | 2009-09-03 21:38:09 +0000 | [diff] [blame] | 425 | // reconstruct the result from when name lookup was performed at template |
| 426 | // definition time. |
| 427 | if (S) |
John McCall | a24dc2e | 2009-11-17 02:14:36 +0000 | [diff] [blame] | 428 | LookupName(Found, S); |
John McCall | f36e02d | 2009-10-09 21:13:30 +0000 | [diff] [blame] | 429 | else if (ScopeLookupResult) |
| 430 | Found.addDecl(ScopeLookupResult); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 431 | |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 432 | ObjectTypeSearchedInScope = true; |
| 433 | } |
Douglas Gregor | ac7cbd8 | 2010-07-28 14:49:07 +0000 | [diff] [blame] | 434 | } else if (!isDependent) { |
| 435 | // Perform unqualified name lookup in the current scope. |
| 436 | LookupName(Found, S); |
| 437 | } |
| 438 | |
| 439 | // If we performed lookup into a dependent context and did not find anything, |
| 440 | // that's fine: just build a dependent nested-name-specifier. |
| 441 | if (Found.empty() && isDependent && |
| 442 | !(LookupCtx && LookupCtx->isRecord() && |
| 443 | (!cast<CXXRecordDecl>(LookupCtx)->hasDefinition() || |
| 444 | !cast<CXXRecordDecl>(LookupCtx)->hasAnyDependentBases()))) { |
Chris Lattner | 4664649 | 2009-12-07 01:36:53 +0000 | [diff] [blame] | 445 | // Don't speculate if we're just trying to improve error recovery. |
| 446 | if (ErrorRecoveryLookup) |
Douglas Gregor | 2e4c34a | 2011-02-24 00:17:56 +0000 | [diff] [blame] | 447 | return true; |
Chris Lattner | 4664649 | 2009-12-07 01:36:53 +0000 | [diff] [blame] | 448 | |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 449 | // We were not able to compute the declaration context for a dependent |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 450 | // base object type or prior nested-name-specifier, so this |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 451 | // nested-name-specifier refers to an unknown specialization. Just build |
| 452 | // a dependent nested-name-specifier. |
Douglas Gregor | 2e4c34a | 2011-02-24 00:17:56 +0000 | [diff] [blame] | 453 | SS.Extend(Context, &Identifier, IdentifierLoc, CCLoc); |
| 454 | return false; |
Douglas Gregor | ac7cbd8 | 2010-07-28 14:49:07 +0000 | [diff] [blame] | 455 | } |
| 456 | |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 457 | // FIXME: Deal with ambiguities cleanly. |
Douglas Gregor | 175a656 | 2009-12-31 08:26:35 +0000 | [diff] [blame] | 458 | |
| 459 | if (Found.empty() && !ErrorRecoveryLookup) { |
| 460 | // We haven't found anything, and we're not recovering from a |
| 461 | // different kind of error, so look for typos. |
| 462 | DeclarationName Name = Found.getLookupName(); |
Douglas Gregor | aaf8716 | 2010-04-14 20:04:41 +0000 | [diff] [blame] | 463 | if (CorrectTypo(Found, S, &SS, LookupCtx, EnteringContext, |
| 464 | CTC_NoKeywords) && |
Douglas Gregor | 175a656 | 2009-12-31 08:26:35 +0000 | [diff] [blame] | 465 | Found.isSingleResult() && |
Douglas Gregor | edc9050 | 2010-02-25 04:46:04 +0000 | [diff] [blame] | 466 | isAcceptableNestedNameSpecifier(Found.getAsSingle<NamedDecl>())) { |
Douglas Gregor | 175a656 | 2009-12-31 08:26:35 +0000 | [diff] [blame] | 467 | if (LookupCtx) |
| 468 | Diag(Found.getNameLoc(), diag::err_no_member_suggest) |
| 469 | << Name << LookupCtx << Found.getLookupName() << SS.getRange() |
Douglas Gregor | 849b243 | 2010-03-31 17:46:05 +0000 | [diff] [blame] | 470 | << FixItHint::CreateReplacement(Found.getNameLoc(), |
| 471 | Found.getLookupName().getAsString()); |
Douglas Gregor | 175a656 | 2009-12-31 08:26:35 +0000 | [diff] [blame] | 472 | else |
| 473 | Diag(Found.getNameLoc(), diag::err_undeclared_var_use_suggest) |
| 474 | << Name << Found.getLookupName() |
Douglas Gregor | 849b243 | 2010-03-31 17:46:05 +0000 | [diff] [blame] | 475 | << FixItHint::CreateReplacement(Found.getNameLoc(), |
| 476 | Found.getLookupName().getAsString()); |
Douglas Gregor | 67dd1d4 | 2010-01-07 00:17:44 +0000 | [diff] [blame] | 477 | |
| 478 | if (NamedDecl *ND = Found.getAsSingle<NamedDecl>()) |
| 479 | Diag(ND->getLocation(), diag::note_previous_decl) |
| 480 | << ND->getDeclName(); |
Douglas Gregor | 12eb5d6 | 2010-06-29 19:27:42 +0000 | [diff] [blame] | 481 | } else { |
Douglas Gregor | 175a656 | 2009-12-31 08:26:35 +0000 | [diff] [blame] | 482 | Found.clear(); |
Douglas Gregor | 2e4c34a | 2011-02-24 00:17:56 +0000 | [diff] [blame] | 483 | Found.setLookupName(&Identifier); |
Douglas Gregor | 12eb5d6 | 2010-06-29 19:27:42 +0000 | [diff] [blame] | 484 | } |
Douglas Gregor | 175a656 | 2009-12-31 08:26:35 +0000 | [diff] [blame] | 485 | } |
| 486 | |
John McCall | 1bcee0a | 2009-12-02 08:25:40 +0000 | [diff] [blame] | 487 | NamedDecl *SD = Found.getAsSingle<NamedDecl>(); |
Douglas Gregor | edc9050 | 2010-02-25 04:46:04 +0000 | [diff] [blame] | 488 | if (isAcceptableNestedNameSpecifier(SD)) { |
Douglas Gregor | c68afe2 | 2009-09-03 21:38:09 +0000 | [diff] [blame] | 489 | if (!ObjectType.isNull() && !ObjectTypeSearchedInScope) { |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 490 | // C++ [basic.lookup.classref]p4: |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 491 | // [...] If the name is found in both contexts, the |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 492 | // class-name-or-namespace-name shall refer to the same entity. |
| 493 | // |
| 494 | // We already found the name in the scope of the object. Now, look |
| 495 | // into the current scope (the scope of the postfix-expression) to |
Douglas Gregor | c68afe2 | 2009-09-03 21:38:09 +0000 | [diff] [blame] | 496 | // see if we can find the same name there. As above, if there is no |
| 497 | // scope, reconstruct the result from the template instantiation itself. |
John McCall | f36e02d | 2009-10-09 21:13:30 +0000 | [diff] [blame] | 498 | NamedDecl *OuterDecl; |
| 499 | if (S) { |
Douglas Gregor | 2e4c34a | 2011-02-24 00:17:56 +0000 | [diff] [blame] | 500 | LookupResult FoundOuter(*this, &Identifier, IdentifierLoc, |
| 501 | LookupNestedNameSpecifierName); |
John McCall | a24dc2e | 2009-11-17 02:14:36 +0000 | [diff] [blame] | 502 | LookupName(FoundOuter, S); |
John McCall | 1bcee0a | 2009-12-02 08:25:40 +0000 | [diff] [blame] | 503 | OuterDecl = FoundOuter.getAsSingle<NamedDecl>(); |
John McCall | f36e02d | 2009-10-09 21:13:30 +0000 | [diff] [blame] | 504 | } else |
| 505 | OuterDecl = ScopeLookupResult; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 506 | |
Douglas Gregor | edc9050 | 2010-02-25 04:46:04 +0000 | [diff] [blame] | 507 | if (isAcceptableNestedNameSpecifier(OuterDecl) && |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 508 | OuterDecl->getCanonicalDecl() != SD->getCanonicalDecl() && |
| 509 | (!isa<TypeDecl>(OuterDecl) || !isa<TypeDecl>(SD) || |
| 510 | !Context.hasSameType( |
Douglas Gregor | c68afe2 | 2009-09-03 21:38:09 +0000 | [diff] [blame] | 511 | Context.getTypeDeclType(cast<TypeDecl>(OuterDecl)), |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 512 | Context.getTypeDeclType(cast<TypeDecl>(SD))))) { |
Douglas Gregor | 2e4c34a | 2011-02-24 00:17:56 +0000 | [diff] [blame] | 513 | if (ErrorRecoveryLookup) |
| 514 | return true; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 515 | |
Douglas Gregor | 2e4c34a | 2011-02-24 00:17:56 +0000 | [diff] [blame] | 516 | Diag(IdentifierLoc, |
| 517 | diag::err_nested_name_member_ref_lookup_ambiguous) |
| 518 | << &Identifier; |
| 519 | Diag(SD->getLocation(), diag::note_ambig_member_ref_object_type) |
| 520 | << ObjectType; |
| 521 | Diag(OuterDecl->getLocation(), diag::note_ambig_member_ref_scope); |
| 522 | |
| 523 | // Fall through so that we'll pick the name we found in the object |
| 524 | // type, since that's probably what the user wanted anyway. |
| 525 | } |
Douglas Gregor | 2dd078a | 2009-09-02 22:59:36 +0000 | [diff] [blame] | 526 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 527 | |
Douglas Gregor | 2e4c34a | 2011-02-24 00:17:56 +0000 | [diff] [blame] | 528 | // If we're just performing this lookup for error-recovery purposes, |
| 529 | // don't extend the nested-name-specifier. Just return now. |
| 530 | if (ErrorRecoveryLookup) |
| 531 | return false; |
| 532 | |
| 533 | if (NamespaceDecl *Namespace = dyn_cast<NamespaceDecl>(SD)) { |
| 534 | SS.Extend(Context, Namespace, IdentifierLoc, CCLoc); |
| 535 | return false; |
| 536 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 537 | |
Douglas Gregor | 2e4c34a | 2011-02-24 00:17:56 +0000 | [diff] [blame] | 538 | if (NamespaceAliasDecl *Alias = dyn_cast<NamespaceAliasDecl>(SD)) { |
Douglas Gregor | 14aba76 | 2011-02-24 02:36:08 +0000 | [diff] [blame] | 539 | SS.Extend(Context, Alias, IdentifierLoc, CCLoc); |
Douglas Gregor | 2e4c34a | 2011-02-24 00:17:56 +0000 | [diff] [blame] | 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, |
Douglas Gregor | aa2187d | 2011-02-28 00:04:36 +0000 | [diff] [blame] | 644 | SourceLocation TemplateLoc, |
| 645 | CXXScopeSpec &SS, |
| 646 | TemplateTy Template, |
| 647 | SourceLocation TemplateNameLoc, |
| 648 | SourceLocation LAngleLoc, |
| 649 | ASTTemplateArgsPtr TemplateArgsIn, |
| 650 | SourceLocation RAngleLoc, |
Douglas Gregor | 2e4c34a | 2011-02-24 00:17:56 +0000 | [diff] [blame] | 651 | SourceLocation CCLoc, |
Douglas Gregor | aa2187d | 2011-02-28 00:04:36 +0000 | [diff] [blame] | 652 | bool EnteringContext) { |
Douglas Gregor | 2e4c34a | 2011-02-24 00:17:56 +0000 | [diff] [blame] | 653 | if (SS.isInvalid()) |
| 654 | return true; |
| 655 | |
Douglas Gregor | aa2187d | 2011-02-28 00:04:36 +0000 | [diff] [blame] | 656 | // Translate the parser's template argument list in our AST format. |
| 657 | TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc); |
| 658 | translateTemplateArguments(TemplateArgsIn, TemplateArgs); |
| 659 | |
| 660 | if (DependentTemplateName *DTN = Template.get().getAsDependentTemplateName()){ |
| 661 | // Handle a dependent template specialization for which we cannot resolve |
| 662 | // the template name. |
| 663 | assert(DTN->getQualifier() |
| 664 | == static_cast<NestedNameSpecifier*>(SS.getScopeRep())); |
| 665 | QualType T = Context.getDependentTemplateSpecializationType(ETK_None, |
Douglas Gregor | 94fdffa | 2011-03-01 20:11:18 +0000 | [diff] [blame^] | 666 | DTN->getQualifier(), |
| 667 | DTN->getIdentifier(), |
Douglas Gregor | aa2187d | 2011-02-28 00:04:36 +0000 | [diff] [blame] | 668 | TemplateArgs); |
| 669 | |
| 670 | // Create source-location information for this type. |
| 671 | TypeLocBuilder Builder; |
| 672 | DependentTemplateSpecializationTypeLoc SpecTL |
| 673 | = Builder.push<DependentTemplateSpecializationTypeLoc>(T); |
| 674 | SpecTL.setLAngleLoc(LAngleLoc); |
| 675 | SpecTL.setRAngleLoc(RAngleLoc); |
| 676 | SpecTL.setKeywordLoc(SourceLocation()); |
| 677 | SpecTL.setNameLoc(TemplateNameLoc); |
Douglas Gregor | 94fdffa | 2011-03-01 20:11:18 +0000 | [diff] [blame^] | 678 | SpecTL.setQualifierLoc(SS.getWithLocInContext(Context)); |
Douglas Gregor | aa2187d | 2011-02-28 00:04:36 +0000 | [diff] [blame] | 679 | for (unsigned I = 0, N = TemplateArgs.size(); I != N; ++I) |
| 680 | SpecTL.setArgLocInfo(I, TemplateArgs[I].getLocInfo()); |
| 681 | |
| 682 | SS.Extend(Context, TemplateLoc, Builder.getTypeLocInContext(Context, T), |
| 683 | CCLoc); |
| 684 | return false; |
| 685 | } |
| 686 | |
| 687 | // We were able to resolve the template name to an actual template. |
| 688 | // Build an appropriate nested-name-specifier. |
| 689 | QualType T = CheckTemplateIdType(Template.get(), TemplateNameLoc, |
| 690 | TemplateArgs); |
Douglas Gregor | 2e4c34a | 2011-02-24 00:17:56 +0000 | [diff] [blame] | 691 | if (T.isNull()) |
| 692 | return true; |
| 693 | |
Douglas Gregor | aa2187d | 2011-02-28 00:04:36 +0000 | [diff] [blame] | 694 | // FIXME: Template aliases will need to check the resulting type to make |
| 695 | // sure that it's either dependent or a tag type. |
| 696 | |
| 697 | // Provide source-location information for the template specialization |
| 698 | // type. |
| 699 | TypeLocBuilder Builder; |
| 700 | TemplateSpecializationTypeLoc SpecTL |
| 701 | = Builder.push<TemplateSpecializationTypeLoc>(T); |
| 702 | |
| 703 | SpecTL.setLAngleLoc(LAngleLoc); |
| 704 | SpecTL.setRAngleLoc(RAngleLoc); |
| 705 | SpecTL.setTemplateNameLoc(TemplateNameLoc); |
| 706 | for (unsigned I = 0, N = TemplateArgs.size(); I != N; ++I) |
| 707 | SpecTL.setArgLocInfo(I, TemplateArgs[I].getLocInfo()); |
| 708 | |
| 709 | |
| 710 | SS.Extend(Context, TemplateLoc, Builder.getTypeLocInContext(Context, T), |
| 711 | CCLoc); |
Douglas Gregor | 2e4c34a | 2011-02-24 00:17:56 +0000 | [diff] [blame] | 712 | return false; |
Douglas Gregor | 39a8de1 | 2009-02-25 19:37:18 +0000 | [diff] [blame] | 713 | } |
| 714 | |
Douglas Gregor | c34348a | 2011-02-24 17:54:50 +0000 | [diff] [blame] | 715 | namespace { |
| 716 | /// \brief A structure that stores a nested-name-specifier annotation, |
| 717 | /// including both the nested-name-specifier |
| 718 | struct NestedNameSpecifierAnnotation { |
| 719 | NestedNameSpecifier *NNS; |
| 720 | }; |
| 721 | } |
| 722 | |
| 723 | void *Sema::SaveNestedNameSpecifierAnnotation(CXXScopeSpec &SS) { |
| 724 | if (SS.isEmpty() || SS.isInvalid()) |
| 725 | return 0; |
| 726 | |
| 727 | void *Mem = Context.Allocate((sizeof(NestedNameSpecifierAnnotation) + |
| 728 | SS.location_size()), |
| 729 | llvm::alignOf<NestedNameSpecifierAnnotation>()); |
| 730 | NestedNameSpecifierAnnotation *Annotation |
| 731 | = new (Mem) NestedNameSpecifierAnnotation; |
| 732 | Annotation->NNS = SS.getScopeRep(); |
| 733 | memcpy(Annotation + 1, SS.location_data(), SS.location_size()); |
| 734 | return Annotation; |
| 735 | } |
| 736 | |
| 737 | void Sema::RestoreNestedNameSpecifierAnnotation(void *AnnotationPtr, |
| 738 | SourceRange AnnotationRange, |
| 739 | CXXScopeSpec &SS) { |
| 740 | if (!AnnotationPtr) { |
| 741 | SS.SetInvalid(AnnotationRange); |
| 742 | return; |
| 743 | } |
| 744 | |
| 745 | NestedNameSpecifierAnnotation *Annotation |
| 746 | = static_cast<NestedNameSpecifierAnnotation *>(AnnotationPtr); |
| 747 | SS.Adopt(NestedNameSpecifierLoc(Annotation->NNS, Annotation + 1)); |
| 748 | } |
| 749 | |
John McCall | e7e278b | 2009-12-11 20:04:54 +0000 | [diff] [blame] | 750 | bool Sema::ShouldEnterDeclaratorScope(Scope *S, const CXXScopeSpec &SS) { |
| 751 | assert(SS.isSet() && "Parser passed invalid CXXScopeSpec."); |
| 752 | |
| 753 | NestedNameSpecifier *Qualifier = |
| 754 | static_cast<NestedNameSpecifier*>(SS.getScopeRep()); |
| 755 | |
| 756 | // There are only two places a well-formed program may qualify a |
| 757 | // declarator: first, when defining a namespace or class member |
| 758 | // out-of-line, and second, when naming an explicitly-qualified |
| 759 | // friend function. The latter case is governed by |
| 760 | // C++03 [basic.lookup.unqual]p10: |
| 761 | // In a friend declaration naming a member function, a name used |
| 762 | // in the function declarator and not part of a template-argument |
| 763 | // in a template-id is first looked up in the scope of the member |
| 764 | // function's class. If it is not found, or if the name is part of |
| 765 | // a template-argument in a template-id, the look up is as |
| 766 | // described for unqualified names in the definition of the class |
| 767 | // granting friendship. |
| 768 | // i.e. we don't push a scope unless it's a class member. |
| 769 | |
| 770 | switch (Qualifier->getKind()) { |
| 771 | case NestedNameSpecifier::Global: |
| 772 | case NestedNameSpecifier::Namespace: |
Douglas Gregor | 14aba76 | 2011-02-24 02:36:08 +0000 | [diff] [blame] | 773 | case NestedNameSpecifier::NamespaceAlias: |
John McCall | e7e278b | 2009-12-11 20:04:54 +0000 | [diff] [blame] | 774 | // These are always namespace scopes. We never want to enter a |
| 775 | // namespace scope from anything but a file context. |
Sebastian Redl | 7a126a4 | 2010-08-31 00:36:30 +0000 | [diff] [blame] | 776 | return CurContext->getRedeclContext()->isFileContext(); |
John McCall | e7e278b | 2009-12-11 20:04:54 +0000 | [diff] [blame] | 777 | |
| 778 | case NestedNameSpecifier::Identifier: |
| 779 | case NestedNameSpecifier::TypeSpec: |
| 780 | case NestedNameSpecifier::TypeSpecWithTemplate: |
| 781 | // These are never namespace scopes. |
| 782 | return true; |
| 783 | } |
| 784 | |
| 785 | // Silence bogus warning. |
| 786 | return false; |
| 787 | } |
| 788 | |
Cedric Venet | 3d65864 | 2009-02-14 20:20:19 +0000 | [diff] [blame] | 789 | /// ActOnCXXEnterDeclaratorScope - Called when a C++ scope specifier (global |
| 790 | /// scope or nested-name-specifier) is parsed, part of a declarator-id. |
| 791 | /// After this method is called, according to [C++ 3.4.3p3], names should be |
| 792 | /// looked up in the declarator-id's scope, until the declarator is parsed and |
| 793 | /// ActOnCXXExitDeclaratorScope is called. |
| 794 | /// The 'SS' should be a non-empty valid CXXScopeSpec. |
Jeffrey Yasskin | 9ab1454 | 2010-04-08 16:38:48 +0000 | [diff] [blame] | 795 | bool Sema::ActOnCXXEnterDeclaratorScope(Scope *S, CXXScopeSpec &SS) { |
Cedric Venet | 3d65864 | 2009-02-14 20:20:19 +0000 | [diff] [blame] | 796 | assert(SS.isSet() && "Parser passed invalid CXXScopeSpec."); |
John McCall | 7a1dc56 | 2009-12-19 10:49:29 +0000 | [diff] [blame] | 797 | |
| 798 | if (SS.isInvalid()) return true; |
| 799 | |
| 800 | DeclContext *DC = computeDeclContext(SS, true); |
| 801 | if (!DC) return true; |
| 802 | |
| 803 | // Before we enter a declarator's context, we need to make sure that |
| 804 | // it is a complete declaration context. |
John McCall | 77bb1aa | 2010-05-01 00:40:08 +0000 | [diff] [blame] | 805 | if (!DC->isDependentContext() && RequireCompleteDeclContext(SS, DC)) |
John McCall | 7a1dc56 | 2009-12-19 10:49:29 +0000 | [diff] [blame] | 806 | return true; |
| 807 | |
| 808 | EnterDeclaratorContext(S, DC); |
John McCall | 31f17ec | 2010-04-27 00:57:59 +0000 | [diff] [blame] | 809 | |
| 810 | // Rebuild the nested name specifier for the new scope. |
| 811 | if (DC->isDependentContext()) |
| 812 | RebuildNestedNameSpecifierInCurrentInstantiation(SS); |
| 813 | |
Douglas Gregor | 7dfd0fb | 2009-09-24 23:39:01 +0000 | [diff] [blame] | 814 | return false; |
Cedric Venet | 3d65864 | 2009-02-14 20:20:19 +0000 | [diff] [blame] | 815 | } |
| 816 | |
| 817 | /// ActOnCXXExitDeclaratorScope - Called when a declarator that previously |
| 818 | /// invoked ActOnCXXEnterDeclaratorScope(), is finished. 'SS' is the same |
| 819 | /// CXXScopeSpec that was passed to ActOnCXXEnterDeclaratorScope as well. |
| 820 | /// Used to indicate that names should revert to being looked up in the |
| 821 | /// defining scope. |
| 822 | void Sema::ActOnCXXExitDeclaratorScope(Scope *S, const CXXScopeSpec &SS) { |
| 823 | assert(SS.isSet() && "Parser passed invalid CXXScopeSpec."); |
Douglas Gregor | dacd434 | 2009-08-26 00:04:55 +0000 | [diff] [blame] | 824 | if (SS.isInvalid()) |
| 825 | return; |
John McCall | 7a1dc56 | 2009-12-19 10:49:29 +0000 | [diff] [blame] | 826 | assert(!SS.isInvalid() && computeDeclContext(SS, true) && |
| 827 | "exiting declarator scope we never really entered"); |
| 828 | ExitDeclaratorContext(S); |
Cedric Venet | 3d65864 | 2009-02-14 20:20:19 +0000 | [diff] [blame] | 829 | } |