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
27 using namespace clang;
28
29 char ExternalASTSource::ID;
30
31 ExternalASTSource::~ExternalASTSource() = default;
32
33 std::optional<ASTSourceDescriptor>
getSourceDescriptor(unsigned ID)34 ExternalASTSource::getSourceDescriptor(unsigned ID) {
35 return std::nullopt;
36 }
37
38 ExternalASTSource::ExtKind
hasExternalDefinitions(const Decl * D)39 ExternalASTSource::hasExternalDefinitions(const Decl *D) {
40 return EK_ReplyHazy;
41 }
42
FindFileRegionDecls(FileID File,unsigned Offset,unsigned Length,SmallVectorImpl<Decl * > & Decls)43 void ExternalASTSource::FindFileRegionDecls(FileID File, unsigned Offset,
44 unsigned Length,
45 SmallVectorImpl<Decl *> &Decls) {}
46
CompleteRedeclChain(const Decl * D)47 void ExternalASTSource::CompleteRedeclChain(const Decl *D) {}
48
CompleteType(TagDecl * Tag)49 void ExternalASTSource::CompleteType(TagDecl *Tag) {}
50
CompleteType(ObjCInterfaceDecl * Class)51 void ExternalASTSource::CompleteType(ObjCInterfaceDecl *Class) {}
52
ReadComments()53 void ExternalASTSource::ReadComments() {}
54
StartedDeserializing()55 void ExternalASTSource::StartedDeserializing() {}
56
FinishedDeserializing()57 void ExternalASTSource::FinishedDeserializing() {}
58
StartTranslationUnit(ASTConsumer * Consumer)59 void ExternalASTSource::StartTranslationUnit(ASTConsumer *Consumer) {}
60
PrintStats()61 void ExternalASTSource::PrintStats() {}
62
layoutRecordType(const RecordDecl * Record,uint64_t & Size,uint64_t & Alignment,llvm::DenseMap<const FieldDecl *,uint64_t> & FieldOffsets,llvm::DenseMap<const CXXRecordDecl *,CharUnits> & BaseOffsets,llvm::DenseMap<const CXXRecordDecl *,CharUnits> & VirtualBaseOffsets)63 bool 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
GetExternalDecl(uint32_t ID)71 Decl *ExternalASTSource::GetExternalDecl(uint32_t ID) {
72 return nullptr;
73 }
74
GetExternalSelector(uint32_t ID)75 Selector ExternalASTSource::GetExternalSelector(uint32_t ID) {
76 return Selector();
77 }
78
GetNumExternalSelectors()79 uint32_t ExternalASTSource::GetNumExternalSelectors() {
80 return 0;
81 }
82
GetExternalDeclStmt(uint64_t Offset)83 Stmt *ExternalASTSource::GetExternalDeclStmt(uint64_t Offset) {
84 return nullptr;
85 }
86
87 CXXCtorInitializer **
GetExternalCXXCtorInitializers(uint64_t Offset)88 ExternalASTSource::GetExternalCXXCtorInitializers(uint64_t Offset) {
89 return nullptr;
90 }
91
92 CXXBaseSpecifier *
GetExternalCXXBaseSpecifiers(uint64_t Offset)93 ExternalASTSource::GetExternalCXXBaseSpecifiers(uint64_t Offset) {
94 return nullptr;
95 }
96
97 bool
FindExternalVisibleDeclsByName(const DeclContext * DC,DeclarationName Name)98 ExternalASTSource::FindExternalVisibleDeclsByName(const DeclContext *DC,
99 DeclarationName Name) {
100 return false;
101 }
102
completeVisibleDeclsMap(const DeclContext * DC)103 void ExternalASTSource::completeVisibleDeclsMap(const DeclContext *DC) {}
104
FindExternalLexicalDecls(const DeclContext * DC,llvm::function_ref<bool (Decl::Kind)> IsKindWeWant,SmallVectorImpl<Decl * > & Result)105 void ExternalASTSource::FindExternalLexicalDecls(
106 const DeclContext *DC, llvm::function_ref<bool(Decl::Kind)> IsKindWeWant,
107 SmallVectorImpl<Decl *> &Result) {}
108
getMemoryBufferSizes(MemoryBufferSizes & sizes) const109 void ExternalASTSource::getMemoryBufferSizes(MemoryBufferSizes &sizes) const {}
110
incrementGeneration(ASTContext & C)111 uint32_t ExternalASTSource::incrementGeneration(ASTContext &C) {
112 uint32_t OldGeneration = CurrentGeneration;
113
114 // Make sure the generation of the topmost external source for the context is
115 // incremented. That might not be us.
116 auto *P = C.getExternalSource();
117 if (P && P != this)
118 CurrentGeneration = P->incrementGeneration(C);
119 else {
120 // FIXME: Only bump the generation counter if the current generation number
121 // has been observed?
122 if (!++CurrentGeneration)
123 llvm::report_fatal_error("generation counter overflowed", false);
124 }
125
126 return OldGeneration;
127 }
128