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//===- ChainedIncludesSource.cpp - Chained PCHs in Memory -------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines the ChainedIncludesSource class, which converts headers
// to chained PCHs in memory, mainly used for testing.
//
//===----------------------------------------------------------------------===//
#include "clang/Basic/Builtins.h"
#include "clang/Basic/TargetInfo.h"
#include "clang/Frontend/ASTUnit.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Frontend/TextDiagnosticPrinter.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Lex/PreprocessorOptions.h"
#include "clang/Parse/ParseAST.h"
#include "clang/Sema/MultiplexExternalSemaSource.h"
#include "clang/Serialization/ASTReader.h"
#include "clang/Serialization/ASTWriter.h"
#include "llvm/Support/MemoryBuffer.h"
using namespace clang;
namespace {
class ChainedIncludesSourceImpl : public ExternalSemaSource {
public:
ChainedIncludesSourceImpl(std::vector<std::unique_ptr<CompilerInstance>> CIs)
: CIs(std::move(CIs)) {}
protected:
//===----------------------------------------------------------------------===//
// ExternalASTSource interface.
//===----------------------------------------------------------------------===//
/// Return the amount of memory used by memory buffers, breaking down
/// by heap-backed versus mmap'ed memory.
void getMemoryBufferSizes(MemoryBufferSizes &sizes) const override {
for (unsigned i = 0, e = CIs.size(); i != e; ++i) {
if (const ExternalASTSource *eSrc =
CIs[i]->getASTContext().getExternalSource()) {
eSrc->getMemoryBufferSizes(sizes);
}
}
}
private:
std::vector<std::unique_ptr<CompilerInstance>> CIs;
};
/// Members of ChainedIncludesSource, factored out so we can initialize
/// them before we initialize the ExternalSemaSource base class.
struct ChainedIncludesSourceMembers {
ChainedIncludesSourceMembers(
std::vector<std::unique_ptr<CompilerInstance>> CIs,
IntrusiveRefCntPtr<ExternalSemaSource> FinalReader)
: Impl(std::move(CIs)), FinalReader(std::move(FinalReader)) {}
ChainedIncludesSourceImpl Impl;
IntrusiveRefCntPtr<ExternalSemaSource> FinalReader;
};
/// Use MultiplexExternalSemaSource to dispatch all ExternalSemaSource
/// calls to the final reader.
class ChainedIncludesSource
: private ChainedIncludesSourceMembers,
public MultiplexExternalSemaSource {
public:
ChainedIncludesSource(std::vector<std::unique_ptr<CompilerInstance>> CIs,
IntrusiveRefCntPtr<ExternalSemaSource> FinalReader)
: ChainedIncludesSourceMembers(std::move(CIs), std::move(FinalReader)),
MultiplexExternalSemaSource(Impl, *this->FinalReader) {}
};
}
static ASTReader *
createASTReader(CompilerInstance &CI, StringRef pchFile,
SmallVectorImpl<std::unique_ptr<llvm::MemoryBuffer>> &MemBufs,
SmallVectorImpl<std::string> &bufNames,
ASTDeserializationListener *deserialListener = nullptr) {
Preprocessor &PP = CI.getPreprocessor();
std::unique_ptr<ASTReader> Reader;
Reader.reset(new ASTReader(
PP, CI.getModuleCache(), &CI.getASTContext(), CI.getPCHContainerReader(),
/*Extensions=*/{},
/*isysroot=*/"", DisableValidationForModuleKind::PCH));
for (unsigned ti = 0; ti < bufNames.size(); ++ti) {
StringRef sr(bufNames[ti]);
Reader->addInMemoryBuffer(sr, std::move(MemBufs[ti]));
}
Reader->setDeserializationListener(deserialListener);
switch (Reader->ReadAST(pchFile, serialization::MK_PCH, SourceLocation(),
ASTReader::ARR_None)) {
case ASTReader::Success:
// Set the predefines buffer as suggested by the PCH reader.
PP.setPredefines(Reader->getSuggestedPredefines());
return Reader.release();
case ASTReader::Failure:
case ASTReader::Missing:
case ASTReader::OutOfDate:
case ASTReader::VersionMismatch:
case ASTReader::ConfigurationMismatch:
case ASTReader::HadErrors:
break;
}
return nullptr;
}
IntrusiveRefCntPtr<ExternalSemaSource> clang::createChainedIncludesSource(
CompilerInstance &CI, IntrusiveRefCntPtr<ExternalSemaSource> &Reader) {
std::vector<std::string> &includes = CI.getPreprocessorOpts().ChainedIncludes;
assert(!includes.empty() && "No '-chain-include' in options!");
std::vector<std::unique_ptr<CompilerInstance>> CIs;
InputKind IK = CI.getFrontendOpts().Inputs[0].getKind();
SmallVector<std::unique_ptr<llvm::MemoryBuffer>, 4> SerialBufs;
SmallVector<std::string, 4> serialBufNames;
for (unsigned i = 0, e = includes.size(); i != e; ++i) {
bool firstInclude = (i == 0);
std::unique_ptr<CompilerInvocation> CInvok;
CInvok.reset(new CompilerInvocation(CI.getInvocation()));
CInvok->getPreprocessorOpts().ChainedIncludes.clear();
CInvok->getPreprocessorOpts().ImplicitPCHInclude.clear();
CInvok->getPreprocessorOpts().DisablePCHOrModuleValidation =
DisableValidationForModuleKind::PCH;
CInvok->getPreprocessorOpts().Includes.clear();
CInvok->getPreprocessorOpts().MacroIncludes.clear();
CInvok->getPreprocessorOpts().Macros.clear();
CInvok->getFrontendOpts().Inputs.clear();
FrontendInputFile InputFile(includes[i], IK);
CInvok->getFrontendOpts().Inputs.push_back(InputFile);
TextDiagnosticPrinter *DiagClient =
new TextDiagnosticPrinter(llvm::errs(), new DiagnosticOptions());
IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
IntrusiveRefCntPtr<DiagnosticsEngine> Diags(
new DiagnosticsEngine(DiagID, &CI.getDiagnosticOpts(), DiagClient));
std::unique_ptr<CompilerInstance> Clang(
new CompilerInstance(CI.getPCHContainerOperations()));
Clang->setInvocation(std::move(CInvok));
Clang->setDiagnostics(Diags.get());
Clang->setTarget(TargetInfo::CreateTargetInfo(
Clang->getDiagnostics(), Clang->getInvocation().TargetOpts));
Clang->createFileManager();
Clang->createSourceManager(Clang->getFileManager());
Clang->createPreprocessor(TU_Prefix);
Clang->getDiagnosticClient().BeginSourceFile(Clang->getLangOpts(),
&Clang->getPreprocessor());
Clang->createASTContext();
auto Buffer = std::make_shared<PCHBuffer>();
ArrayRef<std::shared_ptr<ModuleFileExtension>> Extensions;
auto consumer = std::make_unique<PCHGenerator>(
Clang->getPreprocessor(), Clang->getModuleCache(), "-", /*isysroot=*/"",
Buffer, Extensions, /*AllowASTWithErrors=*/true);
Clang->getASTContext().setASTMutationListener(
consumer->GetASTMutationListener());
Clang->setASTConsumer(std::move(consumer));
Clang->createSema(TU_Prefix, nullptr);
if (firstInclude) {
Preprocessor &PP = Clang->getPreprocessor();
PP.getBuiltinInfo().initializeBuiltins(PP.getIdentifierTable(),
PP.getLangOpts());
} else {
assert(!SerialBufs.empty());
SmallVector<std::unique_ptr<llvm::MemoryBuffer>, 4> Bufs;
// TODO: Pass through the existing MemoryBuffer instances instead of
// allocating new ones.
for (auto &SB : SerialBufs)
Bufs.push_back(llvm::MemoryBuffer::getMemBuffer(SB->getBuffer()));
std::string pchName = includes[i-1];
llvm::raw_string_ostream os(pchName);
os << ".pch" << i-1;
serialBufNames.push_back(os.str());
IntrusiveRefCntPtr<ASTReader> Reader;
Reader = createASTReader(
*Clang, pchName, Bufs, serialBufNames,
Clang->getASTConsumer().GetASTDeserializationListener());
if (!Reader)
return nullptr;
Clang->setASTReader(Reader);
Clang->getASTContext().setExternalSource(Reader);
}
if (!Clang->InitializeSourceManager(InputFile))
return nullptr;
ParseAST(Clang->getSema());
Clang->getDiagnosticClient().EndSourceFile();
assert(Buffer->IsComplete && "serialization did not complete");
auto &serialAST = Buffer->Data;
SerialBufs.push_back(llvm::MemoryBuffer::getMemBufferCopy(
StringRef(serialAST.data(), serialAST.size())));
serialAST.clear();
CIs.push_back(std::move(Clang));
}
assert(!SerialBufs.empty());
std::string pchName = includes.back() + ".pch-final";
serialBufNames.push_back(pchName);
Reader = createASTReader(CI, pchName, SerialBufs, serialBufNames);
if (!Reader)
return nullptr;
return IntrusiveRefCntPtr<ChainedIncludesSource>(
new ChainedIncludesSource(std::move(CIs), Reader));
}
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