1//===- ASTImporterSharedState.h - ASTImporter specific state --*- C++ -*---===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9//  This file defines the ASTImporter specific state, which may be shared
10//  amongst several ASTImporter objects.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef LLVM_CLANG_AST_ASTIMPORTERSHAREDSTATE_H
15#define LLVM_CLANG_AST_ASTIMPORTERSHAREDSTATE_H
16
17#include "clang/AST/ASTImportError.h"
18#include "clang/AST/ASTImporterLookupTable.h"
19#include "clang/AST/Decl.h"
20#include "llvm/ADT/DenseMap.h"
21#include <optional>
22
23namespace clang {
24
25class TranslationUnitDecl;
26
27/// Importer specific state, which may be shared amongst several ASTImporter
28/// objects.
29class ASTImporterSharedState {
30
31  /// Pointer to the import specific lookup table.
32  std::unique_ptr<ASTImporterLookupTable> LookupTable;
33
34  /// Mapping from the already-imported declarations in the "to"
35  /// context to the error status of the import of that declaration.
36  /// This map contains only the declarations that were not correctly
37  /// imported. The same declaration may or may not be included in
38  /// ImportedFromDecls. This map is updated continuously during imports and
39  /// never cleared (like ImportedFromDecls).
40  llvm::DenseMap<Decl *, ASTImportError> ImportErrors;
41
42  /// Set of the newly created declarations.
43  llvm::DenseSet<Decl *> NewDecls;
44
45  // FIXME put ImportedFromDecls here!
46  // And from that point we can better encapsulate the lookup table.
47
48public:
49  ASTImporterSharedState() = default;
50
51  ASTImporterSharedState(TranslationUnitDecl &ToTU) {
52    LookupTable = std::make_unique<ASTImporterLookupTable>(ToTU);
53  }
54
55  ASTImporterLookupTable *getLookupTable() { return LookupTable.get(); }
56
57  void addDeclToLookup(Decl *D) {
58    if (LookupTable)
59      if (auto *ND = dyn_cast<NamedDecl>(D))
60        LookupTable->add(ND);
61  }
62
63  void removeDeclFromLookup(Decl *D) {
64    if (LookupTable)
65      if (auto *ND = dyn_cast<NamedDecl>(D))
66        LookupTable->remove(ND);
67  }
68
69  std::optional<ASTImportError> getImportDeclErrorIfAny(Decl *ToD) const {
70    auto Pos = ImportErrors.find(ToD);
71    if (Pos != ImportErrors.end())
72      return Pos->second;
73    else
74      return std::nullopt;
75  }
76
77  void setImportDeclError(Decl *To, ASTImportError Error) {
78    ImportErrors[To] = Error;
79  }
80
81  bool isNewDecl(const Decl *ToD) const { return NewDecls.count(ToD); }
82
83  void markAsNewDecl(Decl *ToD) { NewDecls.insert(ToD); }
84};
85
86} // namespace clang
87#endif // LLVM_CLANG_AST_ASTIMPORTERSHAREDSTATE_H
88