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/FileManager.h"
20 #include "clang/Basic/IdentifierTable.h"
21 #include "clang/Basic/LLVM.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(GlobalDeclID ID)71 Decl *ExternalASTSource::GetExternalDecl(GlobalDeclID ID) { return nullptr; }
72
GetExternalSelector(uint32_t ID)73 Selector ExternalASTSource::GetExternalSelector(uint32_t ID) {
74 return Selector();
75 }
76
GetNumExternalSelectors()77 uint32_t ExternalASTSource::GetNumExternalSelectors() {
78 return 0;
79 }
80
GetExternalDeclStmt(uint64_t Offset)81 Stmt *ExternalASTSource::GetExternalDeclStmt(uint64_t Offset) {
82 return nullptr;
83 }
84
85 CXXCtorInitializer **
GetExternalCXXCtorInitializers(uint64_t Offset)86 ExternalASTSource::GetExternalCXXCtorInitializers(uint64_t Offset) {
87 return nullptr;
88 }
89
90 CXXBaseSpecifier *
GetExternalCXXBaseSpecifiers(uint64_t Offset)91 ExternalASTSource::GetExternalCXXBaseSpecifiers(uint64_t Offset) {
92 return nullptr;
93 }
94
95 bool
FindExternalVisibleDeclsByName(const DeclContext * DC,DeclarationName Name)96 ExternalASTSource::FindExternalVisibleDeclsByName(const DeclContext *DC,
97 DeclarationName Name) {
98 return false;
99 }
100
completeVisibleDeclsMap(const DeclContext * DC)101 void ExternalASTSource::completeVisibleDeclsMap(const DeclContext *DC) {}
102
FindExternalLexicalDecls(const DeclContext * DC,llvm::function_ref<bool (Decl::Kind)> IsKindWeWant,SmallVectorImpl<Decl * > & Result)103 void ExternalASTSource::FindExternalLexicalDecls(
104 const DeclContext *DC, llvm::function_ref<bool(Decl::Kind)> IsKindWeWant,
105 SmallVectorImpl<Decl *> &Result) {}
106
getMemoryBufferSizes(MemoryBufferSizes & sizes) const107 void ExternalASTSource::getMemoryBufferSizes(MemoryBufferSizes &sizes) const {}
108
incrementGeneration(ASTContext & C)109 uint32_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("generation counter overflowed", false);
122 }
123
124 return OldGeneration;
125 }
126