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
FindFileRegionDecls(FileID File,unsigned Offset,unsigned Length,SmallVectorImpl<Decl * > & Decls)25 void ExternalASTSource::FindFileRegionDecls(FileID File, unsigned Offset,
26 unsigned Length,
27 SmallVectorImpl<Decl *> &Decls) {}
28
CompleteRedeclChain(const Decl * D)29 void ExternalASTSource::CompleteRedeclChain(const Decl *D) {}
30
CompleteType(TagDecl * Tag)31 void ExternalASTSource::CompleteType(TagDecl *Tag) {}
32
CompleteType(ObjCInterfaceDecl * Class)33 void ExternalASTSource::CompleteType(ObjCInterfaceDecl *Class) {}
34
ReadComments()35 void ExternalASTSource::ReadComments() {}
36
StartedDeserializing()37 void ExternalASTSource::StartedDeserializing() {}
38
FinishedDeserializing()39 void ExternalASTSource::FinishedDeserializing() {}
40
StartTranslationUnit(ASTConsumer * Consumer)41 void ExternalASTSource::StartTranslationUnit(ASTConsumer *Consumer) {}
42
PrintStats()43 void ExternalASTSource::PrintStats() { }
44
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)45 bool ExternalASTSource::layoutRecordType(
46 const RecordDecl *Record, uint64_t &Size, uint64_t &Alignment,
47 llvm::DenseMap<const FieldDecl *, uint64_t> &FieldOffsets,
48 llvm::DenseMap<const CXXRecordDecl *, CharUnits> &BaseOffsets,
49 llvm::DenseMap<const CXXRecordDecl *, CharUnits> &VirtualBaseOffsets) {
50 return false;
51 }
52
GetExternalDecl(uint32_t ID)53 Decl *ExternalASTSource::GetExternalDecl(uint32_t ID) {
54 return nullptr;
55 }
56
GetExternalSelector(uint32_t ID)57 Selector ExternalASTSource::GetExternalSelector(uint32_t ID) {
58 return Selector();
59 }
60
GetNumExternalSelectors()61 uint32_t ExternalASTSource::GetNumExternalSelectors() {
62 return 0;
63 }
64
GetExternalDeclStmt(uint64_t Offset)65 Stmt *ExternalASTSource::GetExternalDeclStmt(uint64_t Offset) {
66 return nullptr;
67 }
68
69 CXXBaseSpecifier *
GetExternalCXXBaseSpecifiers(uint64_t Offset)70 ExternalASTSource::GetExternalCXXBaseSpecifiers(uint64_t Offset) {
71 return nullptr;
72 }
73
74 bool
FindExternalVisibleDeclsByName(const DeclContext * DC,DeclarationName Name)75 ExternalASTSource::FindExternalVisibleDeclsByName(const DeclContext *DC,
76 DeclarationName Name) {
77 return false;
78 }
79
completeVisibleDeclsMap(const DeclContext * DC)80 void ExternalASTSource::completeVisibleDeclsMap(const DeclContext *DC) {
81 }
82
83 ExternalLoadResult
FindExternalLexicalDecls(const DeclContext * DC,bool (* isKindWeWant)(Decl::Kind),SmallVectorImpl<Decl * > & Result)84 ExternalASTSource::FindExternalLexicalDecls(const DeclContext *DC,
85 bool (*isKindWeWant)(Decl::Kind),
86 SmallVectorImpl<Decl*> &Result) {
87 return ELR_AlreadyLoaded;
88 }
89
getMemoryBufferSizes(MemoryBufferSizes & sizes) const90 void ExternalASTSource::getMemoryBufferSizes(MemoryBufferSizes &sizes) const { }
91
incrementGeneration(ASTContext & C)92 uint32_t ExternalASTSource::incrementGeneration(ASTContext &C) {
93 uint32_t OldGeneration = CurrentGeneration;
94
95 // Make sure the generation of the topmost external source for the context is
96 // incremented. That might not be us.
97 auto *P = C.getExternalSource();
98 if (P && P != this)
99 CurrentGeneration = P->incrementGeneration(C);
100 else {
101 // FIXME: Only bump the generation counter if the current generation number
102 // has been observed?
103 if (!++CurrentGeneration)
104 llvm::report_fatal_error("generation counter overflowed", false);
105 }
106
107 return OldGeneration;
108 }
109