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/ASTSourceDescriptor.h"
19 #include "clang/Basic/IdentifierTable.h"
20 #include "clang/Basic/LLVM.h"
21 #include "llvm/Support/ErrorHandling.h"
22 #include <cstdint>
23 #include <optional>
24
25 using namespace clang;
26
27 char ExternalASTSource::ID;
28
29 ExternalASTSource::~ExternalASTSource() = default;
30
31 std::optional<ASTSourceDescriptor>
getSourceDescriptor(unsigned ID)32 ExternalASTSource::getSourceDescriptor(unsigned ID) {
33 return std::nullopt;
34 }
35
36 ExternalASTSource::ExtKind
hasExternalDefinitions(const Decl * D)37 ExternalASTSource::hasExternalDefinitions(const Decl *D) {
38 return EK_ReplyHazy;
39 }
40
wasThisDeclarationADefinition(const FunctionDecl * FD)41 bool ExternalASTSource::wasThisDeclarationADefinition(const FunctionDecl *FD) {
42 return false;
43 }
44
FindFileRegionDecls(FileID File,unsigned Offset,unsigned Length,SmallVectorImpl<Decl * > & Decls)45 void ExternalASTSource::FindFileRegionDecls(FileID File, unsigned Offset,
46 unsigned Length,
47 SmallVectorImpl<Decl *> &Decls) {}
48
CompleteRedeclChain(const Decl * D)49 void ExternalASTSource::CompleteRedeclChain(const Decl *D) {}
50
CompleteType(TagDecl * Tag)51 void ExternalASTSource::CompleteType(TagDecl *Tag) {}
52
CompleteType(ObjCInterfaceDecl * Class)53 void ExternalASTSource::CompleteType(ObjCInterfaceDecl *Class) {}
54
ReadComments()55 void ExternalASTSource::ReadComments() {}
56
StartedDeserializing()57 void ExternalASTSource::StartedDeserializing() {}
58
FinishedDeserializing()59 void ExternalASTSource::FinishedDeserializing() {}
60
StartTranslationUnit(ASTConsumer * Consumer)61 void ExternalASTSource::StartTranslationUnit(ASTConsumer *Consumer) {}
62
PrintStats()63 void ExternalASTSource::PrintStats() {}
64
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)65 bool ExternalASTSource::layoutRecordType(
66 const RecordDecl *Record, uint64_t &Size, uint64_t &Alignment,
67 llvm::DenseMap<const FieldDecl *, uint64_t> &FieldOffsets,
68 llvm::DenseMap<const CXXRecordDecl *, CharUnits> &BaseOffsets,
69 llvm::DenseMap<const CXXRecordDecl *, CharUnits> &VirtualBaseOffsets) {
70 return false;
71 }
72
GetExternalDecl(GlobalDeclID ID)73 Decl *ExternalASTSource::GetExternalDecl(GlobalDeclID ID) { return nullptr; }
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
FindExternalVisibleDeclsByName(const DeclContext * DC,DeclarationName Name,const DeclContext * OriginalDC)97 bool ExternalASTSource::FindExternalVisibleDeclsByName(
98 const DeclContext *DC, DeclarationName Name,
99 const DeclContext *OriginalDC) {
100 return false;
101 }
102
LoadExternalSpecializations(const Decl * D,bool)103 bool ExternalASTSource::LoadExternalSpecializations(const Decl *D, bool) {
104 return false;
105 }
106
LoadExternalSpecializations(const Decl * D,ArrayRef<TemplateArgument>)107 bool ExternalASTSource::LoadExternalSpecializations(
108 const Decl *D, ArrayRef<TemplateArgument>) {
109 return false;
110 }
111
completeVisibleDeclsMap(const DeclContext * DC)112 void ExternalASTSource::completeVisibleDeclsMap(const DeclContext *DC) {}
113
FindExternalLexicalDecls(const DeclContext * DC,llvm::function_ref<bool (Decl::Kind)> IsKindWeWant,SmallVectorImpl<Decl * > & Result)114 void ExternalASTSource::FindExternalLexicalDecls(
115 const DeclContext *DC, llvm::function_ref<bool(Decl::Kind)> IsKindWeWant,
116 SmallVectorImpl<Decl *> &Result) {}
117
getMemoryBufferSizes(MemoryBufferSizes & sizes) const118 void ExternalASTSource::getMemoryBufferSizes(MemoryBufferSizes &sizes) const {}
119
incrementGeneration(ASTContext & C)120 uint32_t ExternalASTSource::incrementGeneration(ASTContext &C) {
121 uint32_t OldGeneration = CurrentGeneration;
122
123 // Make sure the generation of the topmost external source for the context is
124 // incremented. That might not be us.
125 auto *P = C.getExternalSource();
126 if (P && P != this)
127 CurrentGeneration = P->incrementGeneration(C);
128 else {
129 // FIXME: Only bump the generation counter if the current generation number
130 // has been observed?
131 if (!++CurrentGeneration)
132 llvm::reportFatalUsageError("generation counter overflowed");
133 }
134
135 return OldGeneration;
136 }
137