1 //===--- ASTImporter.h - Importing ASTs from other Contexts -----*- C++ -*-===// 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 defines the ASTImporter class which imports AST nodes from one 11 // context into another context. 12 // 13 //===----------------------------------------------------------------------===// 14 #ifndef LLVM_CLANG_AST_ASTIMPORTER_H 15 #define LLVM_CLANG_AST_ASTIMPORTER_H 16 17 #include "clang/AST/DeclarationName.h" 18 #include "clang/AST/Type.h" 19 #include "clang/Basic/SourceLocation.h" 20 #include "llvm/ADT/DenseMap.h" 21 #include "llvm/ADT/DenseSet.h" 22 #include "llvm/ADT/SmallVector.h" 23 24 namespace clang { 25 class ASTContext; 26 class Decl; 27 class DeclContext; 28 class DiagnosticsEngine; 29 class Expr; 30 class FileManager; 31 class IdentifierInfo; 32 class NestedNameSpecifier; 33 class Stmt; 34 class TypeSourceInfo; 35 36 /// \brief Imports selected nodes from one AST context into another context, 37 /// merging AST nodes where appropriate. 38 class ASTImporter { 39 public: 40 typedef llvm::DenseSet<std::pair<Decl *, Decl *> > NonEquivalentDeclSet; 41 42 private: 43 /// \brief The contexts we're importing to and from. 44 ASTContext &ToContext, &FromContext; 45 46 /// \brief The file managers we're importing to and from. 47 FileManager &ToFileManager, &FromFileManager; 48 49 /// \brief Whether to perform a minimal import. 50 bool Minimal; 51 52 /// \brief Mapping from the already-imported types in the "from" context 53 /// to the corresponding types in the "to" context. 54 llvm::DenseMap<const Type *, const Type *> ImportedTypes; 55 56 /// \brief Mapping from the already-imported declarations in the "from" 57 /// context to the corresponding declarations in the "to" context. 58 llvm::DenseMap<Decl *, Decl *> ImportedDecls; 59 60 /// \brief Mapping from the already-imported statements in the "from" 61 /// context to the corresponding statements in the "to" context. 62 llvm::DenseMap<Stmt *, Stmt *> ImportedStmts; 63 64 /// \brief Mapping from the already-imported FileIDs in the "from" source 65 /// manager to the corresponding FileIDs in the "to" source manager. 66 llvm::DenseMap<FileID, FileID> ImportedFileIDs; 67 68 /// \brief Imported, anonymous tag declarations that are missing their 69 /// corresponding typedefs. 70 SmallVector<TagDecl *, 4> AnonTagsWithPendingTypedefs; 71 72 /// \brief Declaration (from, to) pairs that are known not to be equivalent 73 /// (which we have already complained about). 74 NonEquivalentDeclSet NonEquivalentDecls; 75 76 public: 77 /// \brief Create a new AST importer. 78 /// 79 /// \param ToContext The context we'll be importing into. 80 /// 81 /// \param ToFileManager The file manager we'll be importing into. 82 /// 83 /// \param FromContext The context we'll be importing from. 84 /// 85 /// \param FromFileManager The file manager we'll be importing into. 86 /// 87 /// \param MinimalImport If true, the importer will attempt to import 88 /// as little as it can, e.g., by importing declarations as forward 89 /// declarations that can be completed at a later point. 90 ASTImporter(ASTContext &ToContext, FileManager &ToFileManager, 91 ASTContext &FromContext, FileManager &FromFileManager, 92 bool MinimalImport); 93 94 virtual ~ASTImporter(); 95 96 /// \brief Whether the importer will perform a minimal import, creating 97 /// to-be-completed forward declarations when possible. 98 bool isMinimalImport() const { return Minimal; } 99 100 /// \brief Import the given type from the "from" context into the "to" 101 /// context. 102 /// 103 /// \returns the equivalent type in the "to" context, or a NULL type if 104 /// an error occurred. 105 QualType Import(QualType FromT); 106 107 /// \brief Import the given type source information from the 108 /// "from" context into the "to" context. 109 /// 110 /// \returns the equivalent type source information in the "to" 111 /// context, or NULL if an error occurred. 112 TypeSourceInfo *Import(TypeSourceInfo *FromTSI); 113 114 /// \brief Import the given declaration from the "from" context into the 115 /// "to" context. 116 /// 117 /// \returns the equivalent declaration in the "to" context, or a NULL type 118 /// if an error occurred. 119 Decl *Import(Decl *FromD); 120 121 /// \brief Import the given declaration context from the "from" 122 /// AST context into the "to" AST context. 123 /// 124 /// \returns the equivalent declaration context in the "to" 125 /// context, or a NULL type if an error occurred. 126 DeclContext *ImportContext(DeclContext *FromDC); 127 128 /// \brief Import the given expression from the "from" context into the 129 /// "to" context. 130 /// 131 /// \returns the equivalent expression in the "to" context, or NULL if 132 /// an error occurred. 133 Expr *Import(Expr *FromE); 134 135 /// \brief Import the given statement from the "from" context into the 136 /// "to" context. 137 /// 138 /// \returns the equivalent statement in the "to" context, or NULL if 139 /// an error occurred. 140 Stmt *Import(Stmt *FromS); 141 142 /// \brief Import the given nested-name-specifier from the "from" 143 /// context into the "to" context. 144 /// 145 /// \returns the equivalent nested-name-specifier in the "to" 146 /// context, or NULL if an error occurred. 147 NestedNameSpecifier *Import(NestedNameSpecifier *FromNNS); 148 149 /// \brief Import the given nested-name-specifier from the "from" 150 /// context into the "to" context. 151 /// 152 /// \returns the equivalent nested-name-specifier in the "to" 153 /// context. 154 NestedNameSpecifierLoc Import(NestedNameSpecifierLoc FromNNS); 155 156 /// \brief Import the goven template name from the "from" context into the 157 /// "to" context. 158 TemplateName Import(TemplateName From); 159 160 /// \brief Import the given source location from the "from" context into 161 /// the "to" context. 162 /// 163 /// \returns the equivalent source location in the "to" context, or an 164 /// invalid source location if an error occurred. 165 SourceLocation Import(SourceLocation FromLoc); 166 167 /// \brief Import the given source range from the "from" context into 168 /// the "to" context. 169 /// 170 /// \returns the equivalent source range in the "to" context, or an 171 /// invalid source location if an error occurred. 172 SourceRange Import(SourceRange FromRange); 173 174 /// \brief Import the given declaration name from the "from" 175 /// context into the "to" context. 176 /// 177 /// \returns the equivalent declaration name in the "to" context, 178 /// or an empty declaration name if an error occurred. 179 DeclarationName Import(DeclarationName FromName); 180 181 /// \brief Import the given identifier from the "from" context 182 /// into the "to" context. 183 /// 184 /// \returns the equivalent identifier in the "to" context. 185 IdentifierInfo *Import(const IdentifierInfo *FromId); 186 187 /// \brief Import the given Objective-C selector from the "from" 188 /// context into the "to" context. 189 /// 190 /// \returns the equivalent selector in the "to" context. 191 Selector Import(Selector FromSel); 192 193 /// \brief Import the given file ID from the "from" context into the 194 /// "to" context. 195 /// 196 /// \returns the equivalent file ID in the source manager of the "to" 197 /// context. 198 FileID Import(FileID); 199 200 /// \brief Import the definition of the given declaration, including all of 201 /// the declarations it contains. 202 /// 203 /// This routine is intended to be used 204 void ImportDefinition(Decl *From); 205 206 /// \brief Cope with a name conflict when importing a declaration into the 207 /// given context. 208 /// 209 /// This routine is invoked whenever there is a name conflict while 210 /// importing a declaration. The returned name will become the name of the 211 /// imported declaration. By default, the returned name is the same as the 212 /// original name, leaving the conflict unresolve such that name lookup 213 /// for this name is likely to find an ambiguity later. 214 /// 215 /// Subclasses may override this routine to resolve the conflict, e.g., by 216 /// renaming the declaration being imported. 217 /// 218 /// \param Name the name of the declaration being imported, which conflicts 219 /// with other declarations. 220 /// 221 /// \param DC the declaration context (in the "to" AST context) in which 222 /// the name is being imported. 223 /// 224 /// \param IDNS the identifier namespace in which the name will be found. 225 /// 226 /// \param Decls the set of declarations with the same name as the 227 /// declaration being imported. 228 /// 229 /// \param NumDecls the number of conflicting declarations in \p Decls. 230 /// 231 /// \returns the name that the newly-imported declaration should have. 232 virtual DeclarationName HandleNameConflict(DeclarationName Name, 233 DeclContext *DC, 234 unsigned IDNS, 235 NamedDecl **Decls, 236 unsigned NumDecls); 237 238 /// \brief Retrieve the context that AST nodes are being imported into. 239 ASTContext &getToContext() const { return ToContext; } 240 241 /// \brief Retrieve the context that AST nodes are being imported from. 242 ASTContext &getFromContext() const { return FromContext; } 243 244 /// \brief Retrieve the file manager that AST nodes are being imported into. 245 FileManager &getToFileManager() const { return ToFileManager; } 246 247 /// \brief Retrieve the file manager that AST nodes are being imported from. 248 FileManager &getFromFileManager() const { return FromFileManager; } 249 250 /// \brief Report a diagnostic in the "to" context. 251 DiagnosticBuilder ToDiag(SourceLocation Loc, unsigned DiagID); 252 253 /// \brief Report a diagnostic in the "from" context. 254 DiagnosticBuilder FromDiag(SourceLocation Loc, unsigned DiagID); 255 256 /// \brief Return the set of declarations that we know are not equivalent. 257 NonEquivalentDeclSet &getNonEquivalentDecls() { return NonEquivalentDecls; } 258 259 /// \brief Note that we have imported the "from" declaration by mapping it 260 /// to the (potentially-newly-created) "to" declaration. 261 /// 262 /// Subclasses can override this function to observe all of the \c From -> 263 /// \c To declaration mappings as they are imported. 264 virtual Decl *Imported(Decl *From, Decl *To); 265 266 /// \brief Determine whether the given types are structurally 267 /// equivalent. 268 bool IsStructurallyEquivalent(QualType From, QualType To); 269 }; 270 } 271 272 #endif // LLVM_CLANG_AST_ASTIMPORTER_H 273
