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llvm-project/clang/lib/Frontend/FrontendActions.cpp

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//===--- FrontendActions.cpp ----------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "clang/Frontend/FrontendActions.h"
#include "clang/AST/ASTConsumer.h"
#include "clang/Basic/FileManager.h"
#include "clang/Frontend/ASTConsumers.h"
#include "clang/Frontend/ASTUnit.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Frontend/FrontendDiagnostic.h"
#include "clang/Frontend/Utils.h"
#include "clang/Lex/HeaderSearch.h"
#include "clang/Lex/Pragma.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Parse/Parser.h"
#include "clang/Serialization/ASTReader.h"
#include "clang/Serialization/ASTWriter.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/raw_ostream.h"
#include <memory>
#include <system_error>
using namespace clang;
//===----------------------------------------------------------------------===//
// Custom Actions
//===----------------------------------------------------------------------===//
ASTConsumer *InitOnlyAction::CreateASTConsumer(CompilerInstance &CI,
StringRef InFile) {
return new ASTConsumer();
}
void InitOnlyAction::ExecuteAction() {
}
//===----------------------------------------------------------------------===//
// AST Consumer Actions
//===----------------------------------------------------------------------===//
ASTConsumer *ASTPrintAction::CreateASTConsumer(CompilerInstance &CI,
StringRef InFile) {
if (raw_ostream *OS = CI.createDefaultOutputFile(false, InFile))
return CreateASTPrinter(OS, CI.getFrontendOpts().ASTDumpFilter);
return nullptr;
}
ASTConsumer *ASTDumpAction::CreateASTConsumer(CompilerInstance &CI,
StringRef InFile) {
return CreateASTDumper(CI.getFrontendOpts().ASTDumpFilter,
CI.getFrontendOpts().ASTDumpLookups);
}
ASTConsumer *ASTDeclListAction::CreateASTConsumer(CompilerInstance &CI,
StringRef InFile) {
return CreateASTDeclNodeLister();
}
ASTConsumer *ASTViewAction::CreateASTConsumer(CompilerInstance &CI,
StringRef InFile) {
return CreateASTViewer();
}
ASTConsumer *DeclContextPrintAction::CreateASTConsumer(CompilerInstance &CI,
StringRef InFile) {
return CreateDeclContextPrinter();
}
ASTConsumer *GeneratePCHAction::CreateASTConsumer(CompilerInstance &CI,
StringRef InFile) {
std::string Sysroot;
std::string OutputFile;
raw_ostream *OS = nullptr;
if (ComputeASTConsumerArguments(CI, InFile, Sysroot, OutputFile, OS))
return nullptr;
if (!CI.getFrontendOpts().RelocatablePCH)
Sysroot.clear();
return new PCHGenerator(CI.getPreprocessor(), OutputFile, nullptr, Sysroot,
OS);
}
bool GeneratePCHAction::ComputeASTConsumerArguments(CompilerInstance &CI,
StringRef InFile,
std::string &Sysroot,
std::string &OutputFile,
raw_ostream *&OS) {
Sysroot = CI.getHeaderSearchOpts().Sysroot;
if (CI.getFrontendOpts().RelocatablePCH && Sysroot.empty()) {
CI.getDiagnostics().Report(diag::err_relocatable_without_isysroot);
return true;
}
// We use createOutputFile here because this is exposed via libclang, and we
// must disable the RemoveFileOnSignal behavior.
// We use a temporary to avoid race conditions.
OS = CI.createOutputFile(CI.getFrontendOpts().OutputFile, /*Binary=*/true,
/*RemoveFileOnSignal=*/false, InFile,
/*Extension=*/"", /*useTemporary=*/true);
if (!OS)
return true;
OutputFile = CI.getFrontendOpts().OutputFile;
return false;
}
ASTConsumer *GenerateModuleAction::CreateASTConsumer(CompilerInstance &CI,
StringRef InFile) {
std::string Sysroot;
std::string OutputFile;
raw_ostream *OS = nullptr;
if (ComputeASTConsumerArguments(CI, InFile, Sysroot, OutputFile, OS))
return nullptr;
return new PCHGenerator(CI.getPreprocessor(), OutputFile, Module,
Sysroot, OS);
}
static SmallVectorImpl<char> &
operator+=(SmallVectorImpl<char> &Includes, StringRef RHS) {
Includes.append(RHS.begin(), RHS.end());
return Includes;
}
static std::error_code addHeaderInclude(StringRef HeaderName,
SmallVectorImpl<char> &Includes,
const LangOptions &LangOpts,
bool IsExternC) {
if (IsExternC && LangOpts.CPlusPlus)
Includes += "extern \"C\" {\n";
if (LangOpts.ObjC1)
Includes += "#import \"";
else
Includes += "#include \"";
// Use an absolute path for the include; there's no reason to think that
// a relative path will work (. might not be on our include path) or that
// it will find the same file.
if (llvm::sys::path::is_absolute(HeaderName)) {
Includes += HeaderName;
} else {
SmallString<256> Header = HeaderName;
if (std::error_code Err = llvm::sys::fs::make_absolute(Header))
return Err;
Includes += Header;
}
Includes += "\"\n";
if (IsExternC && LangOpts.CPlusPlus)
Includes += "}\n";
return std::error_code();
}
static std::error_code addHeaderInclude(const FileEntry *Header,
SmallVectorImpl<char> &Includes,
const LangOptions &LangOpts,
bool IsExternC) {
return addHeaderInclude(Header->getName(), Includes, LangOpts, IsExternC);
}
/// \brief Collect the set of header includes needed to construct the given
/// module and update the TopHeaders file set of the module.
///
/// \param Module The module we're collecting includes from.
///
/// \param Includes Will be augmented with the set of \#includes or \#imports
/// needed to load all of the named headers.
static std::error_code
collectModuleHeaderIncludes(const LangOptions &LangOpts, FileManager &FileMgr,
ModuleMap &ModMap, clang::Module *Module,
SmallVectorImpl<char> &Includes) {
// Don't collect any headers for unavailable modules.
if (!Module->isAvailable())
return std::error_code();
// Add includes for each of these headers.
for (unsigned I = 0, N = Module->NormalHeaders.size(); I != N; ++I) {
const FileEntry *Header = Module->NormalHeaders[I];
Module->addTopHeader(Header);
if (std::error_code Err =
addHeaderInclude(Header, Includes, LangOpts, Module->IsExternC))
return Err;
}
// Note that Module->PrivateHeaders will not be a TopHeader.
if (const FileEntry *UmbrellaHeader = Module->getUmbrellaHeader()) {
Module->addTopHeader(UmbrellaHeader);
if (Module->Parent) {
// Include the umbrella header for submodules.
if (std::error_code Err = addHeaderInclude(UmbrellaHeader, Includes,
LangOpts, Module->IsExternC))
return Err;
}
} else if (const DirectoryEntry *UmbrellaDir = Module->getUmbrellaDir()) {
// Add all of the headers we find in this subdirectory.
std::error_code EC;
SmallString<128> DirNative;
llvm::sys::path::native(UmbrellaDir->getName(), DirNative);
for (llvm::sys::fs::recursive_directory_iterator Dir(DirNative.str(), EC),
DirEnd;
Dir != DirEnd && !EC; Dir.increment(EC)) {
// Check whether this entry has an extension typically associated with
// headers.
if (!llvm::StringSwitch<bool>(llvm::sys::path::extension(Dir->path()))
.Cases(".h", ".H", ".hh", ".hpp", true)
.Default(false))
continue;
// If this header is marked 'unavailable' in this module, don't include
// it.
if (const FileEntry *Header = FileMgr.getFile(Dir->path())) {
if (ModMap.isHeaderUnavailableInModule(Header, Module))
continue;
Module->addTopHeader(Header);
}
// Include this header as part of the umbrella directory.
if (std::error_code Err = addHeaderInclude(Dir->path(), Includes,
LangOpts, Module->IsExternC))
return Err;
}
if (EC)
return EC;
}
// Recurse into submodules.
for (clang::Module::submodule_iterator Sub = Module->submodule_begin(),
SubEnd = Module->submodule_end();
Sub != SubEnd; ++Sub)
if (std::error_code Err = collectModuleHeaderIncludes(
LangOpts, FileMgr, ModMap, *Sub, Includes))
return Err;
return std::error_code();
}
bool GenerateModuleAction::BeginSourceFileAction(CompilerInstance &CI,
StringRef Filename) {
// Find the module map file.
const FileEntry *ModuleMap = CI.getFileManager().getFile(Filename);
if (!ModuleMap) {
CI.getDiagnostics().Report(diag::err_module_map_not_found)
<< Filename;
return false;
}
// Parse the module map file.
HeaderSearch &HS = CI.getPreprocessor().getHeaderSearchInfo();
if (HS.loadModuleMapFile(ModuleMap, IsSystem))
return false;
if (CI.getLangOpts().CurrentModule.empty()) {
CI.getDiagnostics().Report(diag::err_missing_module_name);
// FIXME: Eventually, we could consider asking whether there was just
// a single module described in the module map, and use that as a
// default. Then it would be fairly trivial to just "compile" a module
// map with a single module (the common case).
return false;
}
// If we're being run from the command-line, the module build stack will not
// have been filled in yet, so complete it now in order to allow us to detect
// module cycles.
SourceManager &SourceMgr = CI.getSourceManager();
if (SourceMgr.getModuleBuildStack().empty())
SourceMgr.pushModuleBuildStack(CI.getLangOpts().CurrentModule,
FullSourceLoc(SourceLocation(), SourceMgr));
// Dig out the module definition.
Module = HS.lookupModule(CI.getLangOpts().CurrentModule,
/*AllowSearch=*/false);
if (!Module) {
CI.getDiagnostics().Report(diag::err_missing_module)
<< CI.getLangOpts().CurrentModule << Filename;
return false;
}
// Check whether we can build this module at all.
clang::Module::Requirement Requirement;
clang::Module::HeaderDirective MissingHeader;
if (!Module->isAvailable(CI.getLangOpts(), CI.getTarget(), Requirement,
MissingHeader)) {
if (MissingHeader.FileNameLoc.isValid()) {
CI.getDiagnostics().Report(MissingHeader.FileNameLoc,
diag::err_module_header_missing)
<< MissingHeader.IsUmbrella << MissingHeader.FileName;
} else {
CI.getDiagnostics().Report(diag::err_module_unavailable)
<< Module->getFullModuleName()
<< Requirement.second << Requirement.first;
}
return false;
}
if (!ModuleMapForUniquing)
ModuleMapForUniquing = ModuleMap;
Module->ModuleMap = ModuleMapForUniquing;
assert(Module->ModuleMap && "missing module map file");
FileManager &FileMgr = CI.getFileManager();
// Collect the set of #includes we need to build the module.
SmallString<256> HeaderContents;
std::error_code Err = std::error_code();
if (const FileEntry *UmbrellaHeader = Module->getUmbrellaHeader())
Err = addHeaderInclude(UmbrellaHeader, HeaderContents, CI.getLangOpts(),
Module->IsExternC);
if (!Err)
Err = collectModuleHeaderIncludes(
CI.getLangOpts(), FileMgr,
CI.getPreprocessor().getHeaderSearchInfo().getModuleMap(), Module,
HeaderContents);
if (Err) {
CI.getDiagnostics().Report(diag::err_module_cannot_create_includes)
<< Module->getFullModuleName() << Err.message();
return false;
}
llvm::MemoryBuffer *InputBuffer =
llvm::MemoryBuffer::getMemBufferCopy(HeaderContents,
Module::getModuleInputBufferName());
// Ownership of InputBuffer will be transferred to the SourceManager.
setCurrentInput(FrontendInputFile(InputBuffer, getCurrentFileKind(),
Module->IsSystem));
return true;
}
bool GenerateModuleAction::ComputeASTConsumerArguments(CompilerInstance &CI,
StringRef InFile,
std::string &Sysroot,
std::string &OutputFile,
raw_ostream *&OS) {
// If no output file was provided, figure out where this module would go
// in the module cache.
if (CI.getFrontendOpts().OutputFile.empty()) {
HeaderSearch &HS = CI.getPreprocessor().getHeaderSearchInfo();
CI.getFrontendOpts().OutputFile =
HS.getModuleFileName(CI.getLangOpts().CurrentModule,
ModuleMapForUniquing->getName());
}
// We use createOutputFile here because this is exposed via libclang, and we
// must disable the RemoveFileOnSignal behavior.
// We use a temporary to avoid race conditions.
OS = CI.createOutputFile(CI.getFrontendOpts().OutputFile, /*Binary=*/true,
/*RemoveFileOnSignal=*/false, InFile,
/*Extension=*/"", /*useTemporary=*/true,
/*CreateMissingDirectories=*/true);
if (!OS)
return true;
OutputFile = CI.getFrontendOpts().OutputFile;
return false;
}
ASTConsumer *SyntaxOnlyAction::CreateASTConsumer(CompilerInstance &CI,
StringRef InFile) {
return new ASTConsumer();
}
ASTConsumer *DumpModuleInfoAction::CreateASTConsumer(CompilerInstance &CI,
StringRef InFile) {
return new ASTConsumer();
}
ASTConsumer *VerifyPCHAction::CreateASTConsumer(CompilerInstance &CI,
StringRef InFile) {
return new ASTConsumer();
}
void VerifyPCHAction::ExecuteAction() {
CompilerInstance &CI = getCompilerInstance();
bool Preamble = CI.getPreprocessorOpts().PrecompiledPreambleBytes.first != 0;
const std::string &Sysroot = CI.getHeaderSearchOpts().Sysroot;
std::unique_ptr<ASTReader> Reader(
new ASTReader(CI.getPreprocessor(), CI.getASTContext(),
Sysroot.empty() ? "" : Sysroot.c_str(),
/*DisableValidation*/ false,
/*AllowPCHWithCompilerErrors*/ false,
/*AllowConfigurationMismatch*/ true,
/*ValidateSystemInputs*/ true));
Reader->ReadAST(getCurrentFile(),
Preamble ? serialization::MK_Preamble
: serialization::MK_PCH,
SourceLocation(),
ASTReader::ARR_ConfigurationMismatch);
}
namespace {
/// \brief AST reader listener that dumps module information for a module
/// file.
class DumpModuleInfoListener : public ASTReaderListener {
llvm::raw_ostream &Out;
public:
DumpModuleInfoListener(llvm::raw_ostream &Out) : Out(Out) { }
#define DUMP_BOOLEAN(Value, Text) \
Out.indent(4) << Text << ": " << (Value? "Yes" : "No") << "\n"
bool ReadFullVersionInformation(StringRef FullVersion) override {
Out.indent(2)
<< "Generated by "
<< (FullVersion == getClangFullRepositoryVersion()? "this"
: "a different")
<< " Clang: " << FullVersion << "\n";
return ASTReaderListener::ReadFullVersionInformation(FullVersion);
}
void ReadModuleName(StringRef ModuleName) override {
Out.indent(2) << "Module name: " << ModuleName << "\n";
}
void ReadModuleMapFile(StringRef ModuleMapPath) override {
Out.indent(2) << "Module map file: " << ModuleMapPath << "\n";
}
bool ReadLanguageOptions(const LangOptions &LangOpts,
bool Complain) override {
Out.indent(2) << "Language options:\n";
#define LANGOPT(Name, Bits, Default, Description) \
DUMP_BOOLEAN(LangOpts.Name, Description);
#define ENUM_LANGOPT(Name, Type, Bits, Default, Description) \
Out.indent(4) << Description << ": " \
<< static_cast<unsigned>(LangOpts.get##Name()) << "\n";
#define VALUE_LANGOPT(Name, Bits, Default, Description) \
Out.indent(4) << Description << ": " << LangOpts.Name << "\n";
#define BENIGN_LANGOPT(Name, Bits, Default, Description)
#define BENIGN_ENUM_LANGOPT(Name, Type, Bits, Default, Description)
#include "clang/Basic/LangOptions.def"
return false;
}
bool ReadTargetOptions(const TargetOptions &TargetOpts,
bool Complain) override {
Out.indent(2) << "Target options:\n";
Out.indent(4) << " Triple: " << TargetOpts.Triple << "\n";
Out.indent(4) << " CPU: " << TargetOpts.CPU << "\n";
Out.indent(4) << " ABI: " << TargetOpts.ABI << "\n";
if (!TargetOpts.FeaturesAsWritten.empty()) {
Out.indent(4) << "Target features:\n";
for (unsigned I = 0, N = TargetOpts.FeaturesAsWritten.size();
I != N; ++I) {
Out.indent(6) << TargetOpts.FeaturesAsWritten[I] << "\n";
}
}
return false;
}
virtual bool
ReadDiagnosticOptions(IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts,
bool Complain) override {
Out.indent(2) << "Diagnostic options:\n";
#define DIAGOPT(Name, Bits, Default) DUMP_BOOLEAN(DiagOpts->Name, #Name);
#define ENUM_DIAGOPT(Name, Type, Bits, Default) \
Out.indent(4) << #Name << ": " << DiagOpts->get##Name() << "\n";
#define VALUE_DIAGOPT(Name, Bits, Default) \
Out.indent(4) << #Name << ": " << DiagOpts->Name << "\n";
#include "clang/Basic/DiagnosticOptions.def"
Out.indent(4) << "Warning options:\n";
for (const std::string &Warning : DiagOpts->Warnings) {
Out.indent(6) << "-W" << Warning << "\n";
}
return false;
}
bool ReadHeaderSearchOptions(const HeaderSearchOptions &HSOpts,
bool Complain) override {
Out.indent(2) << "Header search options:\n";
Out.indent(4) << "System root [-isysroot=]: '" << HSOpts.Sysroot << "'\n";
DUMP_BOOLEAN(HSOpts.UseBuiltinIncludes,
"Use builtin include directories [-nobuiltininc]");
DUMP_BOOLEAN(HSOpts.UseStandardSystemIncludes,
"Use standard system include directories [-nostdinc]");
DUMP_BOOLEAN(HSOpts.UseStandardCXXIncludes,
"Use standard C++ include directories [-nostdinc++]");
DUMP_BOOLEAN(HSOpts.UseLibcxx,
"Use libc++ (rather than libstdc++) [-stdlib=]");
return false;
}
bool ReadPreprocessorOptions(const PreprocessorOptions &PPOpts,
bool Complain,
std::string &SuggestedPredefines) override {
Out.indent(2) << "Preprocessor options:\n";
DUMP_BOOLEAN(PPOpts.UsePredefines,
"Uses compiler/target-specific predefines [-undef]");
DUMP_BOOLEAN(PPOpts.DetailedRecord,
"Uses detailed preprocessing record (for indexing)");
if (!PPOpts.Macros.empty()) {
Out.indent(4) << "Predefined macros:\n";
}
for (std::vector<std::pair<std::string, bool/*isUndef*/> >::const_iterator
I = PPOpts.Macros.begin(), IEnd = PPOpts.Macros.end();
I != IEnd; ++I) {
Out.indent(6);
if (I->second)
Out << "-U";
else
Out << "-D";
Out << I->first << "\n";
}
return false;
}
#undef DUMP_BOOLEAN
};
}
void DumpModuleInfoAction::ExecuteAction() {
// Set up the output file.
std::unique_ptr<llvm::raw_fd_ostream> OutFile;
StringRef OutputFileName = getCompilerInstance().getFrontendOpts().OutputFile;
if (!OutputFileName.empty() && OutputFileName != "-") {
std::string ErrorInfo;
OutFile.reset(new llvm::raw_fd_ostream(OutputFileName.str().c_str(),
ErrorInfo, llvm::sys::fs::F_Text));
}
llvm::raw_ostream &Out = OutFile.get()? *OutFile.get() : llvm::outs();
Out << "Information for module file '" << getCurrentFile() << "':\n";
DumpModuleInfoListener Listener(Out);
ASTReader::readASTFileControlBlock(getCurrentFile(),
getCompilerInstance().getFileManager(),
Listener);
}
//===----------------------------------------------------------------------===//
// Preprocessor Actions
//===----------------------------------------------------------------------===//
void DumpRawTokensAction::ExecuteAction() {
Preprocessor &PP = getCompilerInstance().getPreprocessor();
SourceManager &SM = PP.getSourceManager();
// Start lexing the specified input file.
const llvm::MemoryBuffer *FromFile = SM.getBuffer(SM.getMainFileID());
Lexer RawLex(SM.getMainFileID(), FromFile, SM, PP.getLangOpts());
RawLex.SetKeepWhitespaceMode(true);
Token RawTok;
RawLex.LexFromRawLexer(RawTok);
while (RawTok.isNot(tok::eof)) {
PP.DumpToken(RawTok, true);
llvm::errs() << "\n";
RawLex.LexFromRawLexer(RawTok);
}
}
void DumpTokensAction::ExecuteAction() {
Preprocessor &PP = getCompilerInstance().getPreprocessor();
// Start preprocessing the specified input file.
Token Tok;
PP.EnterMainSourceFile();
do {
PP.Lex(Tok);
PP.DumpToken(Tok, true);
llvm::errs() << "\n";
} while (Tok.isNot(tok::eof));
}
void GeneratePTHAction::ExecuteAction() {
CompilerInstance &CI = getCompilerInstance();
if (CI.getFrontendOpts().OutputFile.empty() ||
CI.getFrontendOpts().OutputFile == "-") {
// FIXME: Don't fail this way.
// FIXME: Verify that we can actually seek in the given file.
llvm::report_fatal_error("PTH requires a seekable file for output!");
}
llvm::raw_fd_ostream *OS =
CI.createDefaultOutputFile(true, getCurrentFile());
if (!OS) return;
CacheTokens(CI.getPreprocessor(), OS);
}
void PreprocessOnlyAction::ExecuteAction() {
Preprocessor &PP = getCompilerInstance().getPreprocessor();
// Ignore unknown pragmas.
PP.IgnorePragmas();
Token Tok;
// Start parsing the specified input file.
PP.EnterMainSourceFile();
do {
PP.Lex(Tok);
} while (Tok.isNot(tok::eof));
}
void PrintPreprocessedAction::ExecuteAction() {
CompilerInstance &CI = getCompilerInstance();
// Output file may need to be set to 'Binary', to avoid converting Unix style
// line feeds (<LF>) to Microsoft style line feeds (<CR><LF>).
//
// Look to see what type of line endings the file uses. If there's a
// CRLF, then we won't open the file up in binary mode. If there is
// just an LF or CR, then we will open the file up in binary mode.
// In this fashion, the output format should match the input format, unless
// the input format has inconsistent line endings.
//
// This should be a relatively fast operation since most files won't have
// all of their source code on a single line. However, that is still a
// concern, so if we scan for too long, we'll just assume the file should
// be opened in binary mode.
bool BinaryMode = true;
bool InvalidFile = false;
const SourceManager& SM = CI.getSourceManager();
const llvm::MemoryBuffer *Buffer = SM.getBuffer(SM.getMainFileID(),
&InvalidFile);
if (!InvalidFile) {
const char *cur = Buffer->getBufferStart();
const char *end = Buffer->getBufferEnd();
const char *next = (cur != end) ? cur + 1 : end;
// Limit ourselves to only scanning 256 characters into the source
// file. This is mostly a sanity check in case the file has no
// newlines whatsoever.
if (end - cur > 256) end = cur + 256;
while (next < end) {
if (*cur == 0x0D) { // CR
if (*next == 0x0A) // CRLF
BinaryMode = false;
break;
} else if (*cur == 0x0A) // LF
break;
++cur, ++next;
}
}
raw_ostream *OS = CI.createDefaultOutputFile(BinaryMode, getCurrentFile());
if (!OS) return;
DoPrintPreprocessedInput(CI.getPreprocessor(), OS,
CI.getPreprocessorOutputOpts());
}
void PrintPreambleAction::ExecuteAction() {
switch (getCurrentFileKind()) {
case IK_C:
case IK_CXX:
case IK_ObjC:
case IK_ObjCXX:
case IK_OpenCL:
case IK_CUDA:
break;
case IK_None:
case IK_Asm:
case IK_PreprocessedC:
case IK_PreprocessedCXX:
case IK_PreprocessedObjC:
case IK_PreprocessedObjCXX:
case IK_AST:
case IK_LLVM_IR:
// We can't do anything with these.
return;
}
CompilerInstance &CI = getCompilerInstance();
llvm::MemoryBuffer *Buffer
= CI.getFileManager().getBufferForFile(getCurrentFile());
if (Buffer) {
unsigned Preamble = Lexer::ComputePreamble(Buffer, CI.getLangOpts()).first;
llvm::outs().write(Buffer->getBufferStart(), Preamble);
delete Buffer;
}
}
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