1 //===- ExternalASTSource.cpp - Abstract External AST Interface --*- 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 provides the default implementation of the ExternalASTSource
11 // interface, which enables construction of AST nodes from some external
12 // source.
13 //
14 //===----------------------------------------------------------------------===//
15
16 #include "clang/AST/ExternalASTSource.h"
17 #include "clang/AST/ASTContext.h"
18 #include "clang/AST/DeclarationName.h"
19 #include "llvm/Support/ErrorHandling.h"
20
21 using namespace clang;
22
~ExternalASTSource()23 ExternalASTSource::~ExternalASTSource() { }
24
25 llvm::Optional<ExternalASTSource::ASTSourceDescriptor>
getSourceDescriptor(unsigned ID)26 ExternalASTSource::getSourceDescriptor(unsigned ID) {
27 return None;
28 }
29
30 ExternalASTSource::ASTSourceDescriptor
getSourceDescriptor(const Module & M)31 ExternalASTSource::getSourceDescriptor(const Module &M) {
32 return ASTSourceDescriptor();
33 }
34
FindFileRegionDecls(FileID File,unsigned Offset,unsigned Length,SmallVectorImpl<Decl * > & Decls)35 void ExternalASTSource::FindFileRegionDecls(FileID File, unsigned Offset,
36 unsigned Length,
37 SmallVectorImpl<Decl *> &Decls) {}
38
CompleteRedeclChain(const Decl * D)39 void ExternalASTSource::CompleteRedeclChain(const Decl *D) {}
40
CompleteType(TagDecl * Tag)41 void ExternalASTSource::CompleteType(TagDecl *Tag) {}
42
CompleteType(ObjCInterfaceDecl * Class)43 void ExternalASTSource::CompleteType(ObjCInterfaceDecl *Class) {}
44
ReadComments()45 void ExternalASTSource::ReadComments() {}
46
StartedDeserializing()47 void ExternalASTSource::StartedDeserializing() {}
48
FinishedDeserializing()49 void ExternalASTSource::FinishedDeserializing() {}
50
StartTranslationUnit(ASTConsumer * Consumer)51 void ExternalASTSource::StartTranslationUnit(ASTConsumer *Consumer) {}
52
PrintStats()53 void ExternalASTSource::PrintStats() { }
54
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)55 bool ExternalASTSource::layoutRecordType(
56 const RecordDecl *Record, uint64_t &Size, uint64_t &Alignment,
57 llvm::DenseMap<const FieldDecl *, uint64_t> &FieldOffsets,
58 llvm::DenseMap<const CXXRecordDecl *, CharUnits> &BaseOffsets,
59 llvm::DenseMap<const CXXRecordDecl *, CharUnits> &VirtualBaseOffsets) {
60 return false;
61 }
62
GetExternalDecl(uint32_t ID)63 Decl *ExternalASTSource::GetExternalDecl(uint32_t ID) {
64 return nullptr;
65 }
66
GetExternalSelector(uint32_t ID)67 Selector ExternalASTSource::GetExternalSelector(uint32_t ID) {
68 return Selector();
69 }
70
GetNumExternalSelectors()71 uint32_t ExternalASTSource::GetNumExternalSelectors() {
72 return 0;
73 }
74
GetExternalDeclStmt(uint64_t Offset)75 Stmt *ExternalASTSource::GetExternalDeclStmt(uint64_t Offset) {
76 return nullptr;
77 }
78
79 CXXCtorInitializer **
GetExternalCXXCtorInitializers(uint64_t Offset)80 ExternalASTSource::GetExternalCXXCtorInitializers(uint64_t Offset) {
81 return nullptr;
82 }
83
84 CXXBaseSpecifier *
GetExternalCXXBaseSpecifiers(uint64_t Offset)85 ExternalASTSource::GetExternalCXXBaseSpecifiers(uint64_t Offset) {
86 return nullptr;
87 }
88
89 bool
FindExternalVisibleDeclsByName(const DeclContext * DC,DeclarationName Name)90 ExternalASTSource::FindExternalVisibleDeclsByName(const DeclContext *DC,
91 DeclarationName Name) {
92 return false;
93 }
94
completeVisibleDeclsMap(const DeclContext * DC)95 void ExternalASTSource::completeVisibleDeclsMap(const DeclContext *DC) {
96 }
97
98 ExternalLoadResult
FindExternalLexicalDecls(const DeclContext * DC,bool (* isKindWeWant)(Decl::Kind),SmallVectorImpl<Decl * > & Result)99 ExternalASTSource::FindExternalLexicalDecls(const DeclContext *DC,
100 bool (*isKindWeWant)(Decl::Kind),
101 SmallVectorImpl<Decl*> &Result) {
102 return ELR_AlreadyLoaded;
103 }
104
getMemoryBufferSizes(MemoryBufferSizes & sizes) const105 void ExternalASTSource::getMemoryBufferSizes(MemoryBufferSizes &sizes) const { }
106
incrementGeneration(ASTContext & C)107 uint32_t ExternalASTSource::incrementGeneration(ASTContext &C) {
108 uint32_t OldGeneration = CurrentGeneration;
109
110 // Make sure the generation of the topmost external source for the context is
111 // incremented. That might not be us.
112 auto *P = C.getExternalSource();
113 if (P && P != this)
114 CurrentGeneration = P->incrementGeneration(C);
115 else {
116 // FIXME: Only bump the generation counter if the current generation number
117 // has been observed?
118 if (!++CurrentGeneration)
119 llvm::report_fatal_error("generation counter overflowed", false);
120 }
121
122 return OldGeneration;
123 }
124