1 //===- ChainedIncludesSource.cpp - Chained PCHs in Memory -------*- 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 defines the ChainedIncludesSource class, which converts headers
11 // to chained PCHs in memory, mainly used for testing.
12 //
13 //===----------------------------------------------------------------------===//
14
15 #include "clang/Basic/TargetInfo.h"
16 #include "clang/Frontend/ASTUnit.h"
17 #include "clang/Frontend/CompilerInstance.h"
18 #include "clang/Frontend/TextDiagnosticPrinter.h"
19 #include "clang/Lex/Preprocessor.h"
20 #include "clang/Parse/ParseAST.h"
21 #include "clang/Serialization/ASTReader.h"
22 #include "clang/Serialization/ASTWriter.h"
23 #include "llvm/Support/MemoryBuffer.h"
24
25 using namespace clang;
26
27 namespace {
28 class ChainedIncludesSource : public ExternalSemaSource {
29 public:
30 ~ChainedIncludesSource() override;
31
getFinalReader() const32 ExternalSemaSource &getFinalReader() const { return *FinalReader; }
33
34 std::vector<CompilerInstance *> CIs;
35 IntrusiveRefCntPtr<ExternalSemaSource> FinalReader;
36
37 protected:
38 //===----------------------------------------------------------------------===//
39 // ExternalASTSource interface.
40 //===----------------------------------------------------------------------===//
41
42 Decl *GetExternalDecl(uint32_t ID) override;
43 Selector GetExternalSelector(uint32_t ID) override;
44 uint32_t GetNumExternalSelectors() override;
45 Stmt *GetExternalDeclStmt(uint64_t Offset) override;
46 CXXCtorInitializer **GetExternalCXXCtorInitializers(uint64_t Offset) override;
47 CXXBaseSpecifier *GetExternalCXXBaseSpecifiers(uint64_t Offset) override;
48 bool FindExternalVisibleDeclsByName(const DeclContext *DC,
49 DeclarationName Name) override;
50 void
51 FindExternalLexicalDecls(const DeclContext *DC,
52 llvm::function_ref<bool(Decl::Kind)> IsKindWeWant,
53 SmallVectorImpl<Decl *> &Result) override;
54 void CompleteType(TagDecl *Tag) override;
55 void CompleteType(ObjCInterfaceDecl *Class) override;
56 void StartedDeserializing() override;
57 void FinishedDeserializing() override;
58 void StartTranslationUnit(ASTConsumer *Consumer) override;
59 void PrintStats() override;
60
61 /// Return the amount of memory used by memory buffers, breaking down
62 /// by heap-backed versus mmap'ed memory.
63 void getMemoryBufferSizes(MemoryBufferSizes &sizes) const override;
64
65 //===----------------------------------------------------------------------===//
66 // ExternalSemaSource interface.
67 //===----------------------------------------------------------------------===//
68
69 void InitializeSema(Sema &S) override;
70 void ForgetSema() override;
71 void ReadMethodPool(Selector Sel) override;
72 bool LookupUnqualified(LookupResult &R, Scope *S) override;
73 };
74 }
75
76 static ASTReader *
createASTReader(CompilerInstance & CI,StringRef pchFile,SmallVectorImpl<std::unique_ptr<llvm::MemoryBuffer>> & MemBufs,SmallVectorImpl<std::string> & bufNames,ASTDeserializationListener * deserialListener=nullptr)77 createASTReader(CompilerInstance &CI, StringRef pchFile,
78 SmallVectorImpl<std::unique_ptr<llvm::MemoryBuffer>> &MemBufs,
79 SmallVectorImpl<std::string> &bufNames,
80 ASTDeserializationListener *deserialListener = nullptr) {
81 Preprocessor &PP = CI.getPreprocessor();
82 std::unique_ptr<ASTReader> Reader;
83 Reader.reset(new ASTReader(PP, CI.getASTContext(),
84 CI.getPCHContainerReader(),
85 /*Extensions=*/{ },
86 /*isysroot=*/"", /*DisableValidation=*/true));
87 for (unsigned ti = 0; ti < bufNames.size(); ++ti) {
88 StringRef sr(bufNames[ti]);
89 Reader->addInMemoryBuffer(sr, std::move(MemBufs[ti]));
90 }
91 Reader->setDeserializationListener(deserialListener);
92 switch (Reader->ReadAST(pchFile, serialization::MK_PCH, SourceLocation(),
93 ASTReader::ARR_None)) {
94 case ASTReader::Success:
95 // Set the predefines buffer as suggested by the PCH reader.
96 PP.setPredefines(Reader->getSuggestedPredefines());
97 return Reader.release();
98
99 case ASTReader::Failure:
100 case ASTReader::Missing:
101 case ASTReader::OutOfDate:
102 case ASTReader::VersionMismatch:
103 case ASTReader::ConfigurationMismatch:
104 case ASTReader::HadErrors:
105 break;
106 }
107 return nullptr;
108 }
109
~ChainedIncludesSource()110 ChainedIncludesSource::~ChainedIncludesSource() {
111 for (unsigned i = 0, e = CIs.size(); i != e; ++i)
112 delete CIs[i];
113 }
114
createChainedIncludesSource(CompilerInstance & CI,IntrusiveRefCntPtr<ExternalSemaSource> & Reader)115 IntrusiveRefCntPtr<ExternalSemaSource> clang::createChainedIncludesSource(
116 CompilerInstance &CI, IntrusiveRefCntPtr<ExternalSemaSource> &Reader) {
117
118 std::vector<std::string> &includes = CI.getPreprocessorOpts().ChainedIncludes;
119 assert(!includes.empty() && "No '-chain-include' in options!");
120
121 IntrusiveRefCntPtr<ChainedIncludesSource> source(new ChainedIncludesSource());
122 InputKind IK = CI.getFrontendOpts().Inputs[0].getKind();
123
124 SmallVector<std::unique_ptr<llvm::MemoryBuffer>, 4> SerialBufs;
125 SmallVector<std::string, 4> serialBufNames;
126
127 for (unsigned i = 0, e = includes.size(); i != e; ++i) {
128 bool firstInclude = (i == 0);
129 std::unique_ptr<CompilerInvocation> CInvok;
130 CInvok.reset(new CompilerInvocation(CI.getInvocation()));
131
132 CInvok->getPreprocessorOpts().ChainedIncludes.clear();
133 CInvok->getPreprocessorOpts().ImplicitPCHInclude.clear();
134 CInvok->getPreprocessorOpts().ImplicitPTHInclude.clear();
135 CInvok->getPreprocessorOpts().DisablePCHValidation = true;
136 CInvok->getPreprocessorOpts().Includes.clear();
137 CInvok->getPreprocessorOpts().MacroIncludes.clear();
138 CInvok->getPreprocessorOpts().Macros.clear();
139
140 CInvok->getFrontendOpts().Inputs.clear();
141 FrontendInputFile InputFile(includes[i], IK);
142 CInvok->getFrontendOpts().Inputs.push_back(InputFile);
143
144 TextDiagnosticPrinter *DiagClient =
145 new TextDiagnosticPrinter(llvm::errs(), new DiagnosticOptions());
146 IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
147 IntrusiveRefCntPtr<DiagnosticsEngine> Diags(
148 new DiagnosticsEngine(DiagID, &CI.getDiagnosticOpts(), DiagClient));
149
150 std::unique_ptr<CompilerInstance> Clang(
151 new CompilerInstance(CI.getPCHContainerOperations()));
152 Clang->setInvocation(CInvok.release());
153 Clang->setDiagnostics(Diags.get());
154 Clang->setTarget(TargetInfo::CreateTargetInfo(
155 Clang->getDiagnostics(), Clang->getInvocation().TargetOpts));
156 Clang->createFileManager();
157 Clang->createSourceManager(Clang->getFileManager());
158 Clang->createPreprocessor(TU_Prefix);
159 Clang->getDiagnosticClient().BeginSourceFile(Clang->getLangOpts(),
160 &Clang->getPreprocessor());
161 Clang->createASTContext();
162
163 auto Buffer = std::make_shared<PCHBuffer>();
164 ArrayRef<llvm::IntrusiveRefCntPtr<ModuleFileExtension>> Extensions;
165 auto consumer = llvm::make_unique<PCHGenerator>(
166 Clang->getPreprocessor(), "-", nullptr, /*isysroot=*/"", Buffer,
167 Extensions);
168 Clang->getASTContext().setASTMutationListener(
169 consumer->GetASTMutationListener());
170 Clang->setASTConsumer(std::move(consumer));
171 Clang->createSema(TU_Prefix, nullptr);
172
173 if (firstInclude) {
174 Preprocessor &PP = Clang->getPreprocessor();
175 PP.getBuiltinInfo().initializeBuiltins(PP.getIdentifierTable(),
176 PP.getLangOpts());
177 } else {
178 assert(!SerialBufs.empty());
179 SmallVector<std::unique_ptr<llvm::MemoryBuffer>, 4> Bufs;
180 // TODO: Pass through the existing MemoryBuffer instances instead of
181 // allocating new ones.
182 for (auto &SB : SerialBufs)
183 Bufs.push_back(llvm::MemoryBuffer::getMemBuffer(SB->getBuffer()));
184 std::string pchName = includes[i-1];
185 llvm::raw_string_ostream os(pchName);
186 os << ".pch" << i-1;
187 serialBufNames.push_back(os.str());
188
189 IntrusiveRefCntPtr<ASTReader> Reader;
190 Reader = createASTReader(
191 *Clang, pchName, Bufs, serialBufNames,
192 Clang->getASTConsumer().GetASTDeserializationListener());
193 if (!Reader)
194 return nullptr;
195 Clang->setModuleManager(Reader);
196 Clang->getASTContext().setExternalSource(Reader);
197 }
198
199 if (!Clang->InitializeSourceManager(InputFile))
200 return nullptr;
201
202 ParseAST(Clang->getSema());
203 Clang->getDiagnosticClient().EndSourceFile();
204 assert(Buffer->IsComplete && "serialization did not complete");
205 auto &serialAST = Buffer->Data;
206 SerialBufs.push_back(llvm::MemoryBuffer::getMemBufferCopy(
207 StringRef(serialAST.data(), serialAST.size())));
208 serialAST.clear();
209 source->CIs.push_back(Clang.release());
210 }
211
212 assert(!SerialBufs.empty());
213 std::string pchName = includes.back() + ".pch-final";
214 serialBufNames.push_back(pchName);
215 Reader = createASTReader(CI, pchName, SerialBufs, serialBufNames);
216 if (!Reader)
217 return nullptr;
218
219 source->FinalReader = Reader;
220 return source;
221 }
222
223 //===----------------------------------------------------------------------===//
224 // ExternalASTSource interface.
225 //===----------------------------------------------------------------------===//
226
GetExternalDecl(uint32_t ID)227 Decl *ChainedIncludesSource::GetExternalDecl(uint32_t ID) {
228 return getFinalReader().GetExternalDecl(ID);
229 }
GetExternalSelector(uint32_t ID)230 Selector ChainedIncludesSource::GetExternalSelector(uint32_t ID) {
231 return getFinalReader().GetExternalSelector(ID);
232 }
GetNumExternalSelectors()233 uint32_t ChainedIncludesSource::GetNumExternalSelectors() {
234 return getFinalReader().GetNumExternalSelectors();
235 }
GetExternalDeclStmt(uint64_t Offset)236 Stmt *ChainedIncludesSource::GetExternalDeclStmt(uint64_t Offset) {
237 return getFinalReader().GetExternalDeclStmt(Offset);
238 }
239 CXXBaseSpecifier *
GetExternalCXXBaseSpecifiers(uint64_t Offset)240 ChainedIncludesSource::GetExternalCXXBaseSpecifiers(uint64_t Offset) {
241 return getFinalReader().GetExternalCXXBaseSpecifiers(Offset);
242 }
243 CXXCtorInitializer **
GetExternalCXXCtorInitializers(uint64_t Offset)244 ChainedIncludesSource::GetExternalCXXCtorInitializers(uint64_t Offset) {
245 return getFinalReader().GetExternalCXXCtorInitializers(Offset);
246 }
247 bool
FindExternalVisibleDeclsByName(const DeclContext * DC,DeclarationName Name)248 ChainedIncludesSource::FindExternalVisibleDeclsByName(const DeclContext *DC,
249 DeclarationName Name) {
250 return getFinalReader().FindExternalVisibleDeclsByName(DC, Name);
251 }
FindExternalLexicalDecls(const DeclContext * DC,llvm::function_ref<bool (Decl::Kind)> IsKindWeWant,SmallVectorImpl<Decl * > & Result)252 void ChainedIncludesSource::FindExternalLexicalDecls(
253 const DeclContext *DC, llvm::function_ref<bool(Decl::Kind)> IsKindWeWant,
254 SmallVectorImpl<Decl *> &Result) {
255 return getFinalReader().FindExternalLexicalDecls(DC, IsKindWeWant, Result);
256 }
CompleteType(TagDecl * Tag)257 void ChainedIncludesSource::CompleteType(TagDecl *Tag) {
258 return getFinalReader().CompleteType(Tag);
259 }
CompleteType(ObjCInterfaceDecl * Class)260 void ChainedIncludesSource::CompleteType(ObjCInterfaceDecl *Class) {
261 return getFinalReader().CompleteType(Class);
262 }
StartedDeserializing()263 void ChainedIncludesSource::StartedDeserializing() {
264 return getFinalReader().StartedDeserializing();
265 }
FinishedDeserializing()266 void ChainedIncludesSource::FinishedDeserializing() {
267 return getFinalReader().FinishedDeserializing();
268 }
StartTranslationUnit(ASTConsumer * Consumer)269 void ChainedIncludesSource::StartTranslationUnit(ASTConsumer *Consumer) {
270 return getFinalReader().StartTranslationUnit(Consumer);
271 }
PrintStats()272 void ChainedIncludesSource::PrintStats() {
273 return getFinalReader().PrintStats();
274 }
getMemoryBufferSizes(MemoryBufferSizes & sizes) const275 void ChainedIncludesSource::getMemoryBufferSizes(MemoryBufferSizes &sizes)const{
276 for (unsigned i = 0, e = CIs.size(); i != e; ++i) {
277 if (const ExternalASTSource *eSrc =
278 CIs[i]->getASTContext().getExternalSource()) {
279 eSrc->getMemoryBufferSizes(sizes);
280 }
281 }
282
283 getFinalReader().getMemoryBufferSizes(sizes);
284 }
285
InitializeSema(Sema & S)286 void ChainedIncludesSource::InitializeSema(Sema &S) {
287 return getFinalReader().InitializeSema(S);
288 }
ForgetSema()289 void ChainedIncludesSource::ForgetSema() {
290 return getFinalReader().ForgetSema();
291 }
ReadMethodPool(Selector Sel)292 void ChainedIncludesSource::ReadMethodPool(Selector Sel) {
293 getFinalReader().ReadMethodPool(Sel);
294 }
LookupUnqualified(LookupResult & R,Scope * S)295 bool ChainedIncludesSource::LookupUnqualified(LookupResult &R, Scope *S) {
296 return getFinalReader().LookupUnqualified(R, S);
297 }
298
299