1//===- ExternalASTSource.cpp - Abstract External AST Interface ------------===//
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 provides the default implementation of the ExternalASTSource
10// interface, which enables construction of AST nodes from some external
11// source.
12//
13//===----------------------------------------------------------------------===//
14
15#include "clang/AST/ExternalASTSource.h"
16#include "clang/AST/ASTContext.h"
17#include "clang/AST/DeclarationName.h"
18#include "clang/Basic/FileManager.h"
19#include "clang/Basic/IdentifierTable.h"
20#include "clang/Basic/LLVM.h"
21#include "clang/Basic/Module.h"
22#include "clang/Basic/SourceManager.h"
23#include "llvm/Support/ErrorHandling.h"
24#include <cstdint>
25#include <optional>
26
27using namespace clang;
28
29char ExternalASTSource::ID;
30
31ExternalASTSource::~ExternalASTSource() = default;
32
33std::optional<ASTSourceDescriptor>
34ExternalASTSource::getSourceDescriptor(unsigned ID) {
35 return std::nullopt;
36}
37
38ExternalASTSource::ExtKind
39ExternalASTSource::hasExternalDefinitions(const Decl *D) {
40 return EK_ReplyHazy;
41}
42
43void ExternalASTSource::FindFileRegionDecls(FileID File, unsigned Offset,
44 unsigned Length,
45 SmallVectorImpl<Decl *> &Decls) {}
46
47void ExternalASTSource::CompleteRedeclChain(const Decl *D) {}
48
49void ExternalASTSource::CompleteType(TagDecl *Tag) {}
50
51void ExternalASTSource::CompleteType(ObjCInterfaceDecl *Class) {}
52
53void ExternalASTSource::ReadComments() {}
54
55void ExternalASTSource::StartedDeserializing() {}
56
57void ExternalASTSource::FinishedDeserializing() {}
58
59void ExternalASTSource::StartTranslationUnit(ASTConsumer *Consumer) {}
60
61void ExternalASTSource::PrintStats() {}
62
63bool ExternalASTSource::layoutRecordType(
64 const RecordDecl *Record, uint64_t &Size, uint64_t &Alignment,
65 llvm::DenseMap<const FieldDecl *, uint64_t> &FieldOffsets,
66 llvm::DenseMap<const CXXRecordDecl *, CharUnits> &BaseOffsets,
67 llvm::DenseMap<const CXXRecordDecl *, CharUnits> &VirtualBaseOffsets) {
68 return false;
69}
70
71Decl *ExternalASTSource::GetExternalDecl(Decl::DeclID ID) { return nullptr; }
72
73Selector ExternalASTSource::GetExternalSelector(uint32_t ID) {
74 return Selector();
75}
76
77uint32_t ExternalASTSource::GetNumExternalSelectors() {
78 return 0;
79}
80
81Stmt *ExternalASTSource::GetExternalDeclStmt(uint64_t Offset) {
82 return nullptr;
83}
84
85CXXCtorInitializer **
86ExternalASTSource::GetExternalCXXCtorInitializers(uint64_t Offset) {
87 return nullptr;
88}
89
90CXXBaseSpecifier *
91ExternalASTSource::GetExternalCXXBaseSpecifiers(uint64_t Offset) {
92 return nullptr;
93}
94
95bool
96ExternalASTSource::FindExternalVisibleDeclsByName(const DeclContext *DC,
97 DeclarationName Name) {
98 return false;
99}
100
101void ExternalASTSource::completeVisibleDeclsMap(const DeclContext *DC) {}
102
103void ExternalASTSource::FindExternalLexicalDecls(
104 const DeclContext *DC, llvm::function_ref<bool(Decl::Kind)> IsKindWeWant,
105 SmallVectorImpl<Decl *> &Result) {}
106
107void ExternalASTSource::getMemoryBufferSizes(MemoryBufferSizes &sizes) const {}
108
109uint32_t ExternalASTSource::incrementGeneration(ASTContext &C) {
110 uint32_t OldGeneration = CurrentGeneration;
111
112 // Make sure the generation of the topmost external source for the context is
113 // incremented. That might not be us.
114 auto *P = C.getExternalSource();
115 if (P && P != this)
116 CurrentGeneration = P->incrementGeneration(C);
117 else {
118 // FIXME: Only bump the generation counter if the current generation number
119 // has been observed?
120 if (!++CurrentGeneration)
121 llvm::report_fatal_error(reason: "generation counter overflowed", gen_crash_diag: false);
122 }
123
124 return OldGeneration;
125}
126

source code of clang/lib/AST/ExternalASTSource.cpp