clang-1/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/Lex/HeaderSearch.h"
#include "clang/Lex/Pragma.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Parse/Parser.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/Serialization/ASTWriter.h"
#include "llvm/ADT/OwningPtr.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/system_error.h"
#include <set>
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);
return 0;
}
ASTConsumer *ASTDumpAction::CreateASTConsumer(CompilerInstance &CI,
StringRef InFile) {
return CreateASTDumper();
}
ASTConsumer *ASTDumpXMLAction::CreateASTConsumer(CompilerInstance &CI,
StringRef InFile) {
raw_ostream *OS;
if (CI.getFrontendOpts().OutputFile.empty())
OS = &llvm::outs();
else
OS = CI.createDefaultOutputFile(false, InFile);
if (!OS) return 0;
return CreateASTDumperXML(*OS);
}
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 = 0;
if (ComputeASTConsumerArguments(CI, InFile, Sysroot, OutputFile, OS))
return 0;
if (!CI.getFrontendOpts().RelocatablePCH)
Sysroot.clear();
return new PCHGenerator(CI.getPreprocessor(), OutputFile, 0, 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 = 0;
if (ComputeASTConsumerArguments(CI, InFile, Sysroot, OutputFile, OS))
return 0;
return new PCHGenerator(CI.getPreprocessor(), OutputFile, Module,
Sysroot, OS);
}
/// \brief Collect the set of header includes needed to construct the given
/// 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 void collectModuleHeaderIncludes(const LangOptions &LangOpts,
FileManager &FileMgr,
ModuleMap &ModMap,
clang::Module *Module,
SmallString<256> &Includes) {
// Don't collect any headers for unavailable modules.
if (!Module->isAvailable())
return;
// Add includes for each of these headers.
for (unsigned I = 0, N = Module->Headers.size(); I != N; ++I) {
if (LangOpts.ObjC1)
Includes += "#import \"";
else
Includes += "#include \"";
Includes += Module->Headers[I]->getName();
Includes += "\"\n";
}
if (const FileEntry *UmbrellaHeader = Module->getUmbrellaHeader()) {
if (Module->Parent) {
// Include the umbrella header for submodules.
if (LangOpts.ObjC1)
Includes += "#import \"";
else
Includes += "#include \"";
Includes += UmbrellaHeader->getName();
Includes += "\"\n";
}
} else if (const DirectoryEntry *UmbrellaDir = Module->getUmbrellaDir()) {
// Add all of the headers we find in this subdirectory.
llvm::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.isHeaderInUnavailableModule(Header))
continue;
// Include this header umbrella header for submodules.
if (LangOpts.ObjC1)
Includes += "#import \"";
else
Includes += "#include \"";
Includes += Dir->path();
Includes += "\"\n";
}
}
// Recurse into submodules.
for (clang::Module::submodule_iterator Sub = Module->submodule_begin(),
SubEnd = Module->submodule_end();
Sub != SubEnd; ++Sub)
collectModuleHeaderIncludes(LangOpts, FileMgr, ModMap, *Sub, Includes);
}
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))
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;
}
// 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.
StringRef Feature;
if (!Module->isAvailable(CI.getLangOpts(), CI.getTarget(), Feature)) {
CI.getDiagnostics().Report(diag::err_module_unavailable)
<< Module->getFullModuleName()
<< Feature;
return false;
}
// Do we have an umbrella header for this module?
const FileEntry *UmbrellaHeader = Module->getUmbrellaHeader();
// Collect the set of #includes we need to build the module.
SmallString<256> HeaderContents;
collectModuleHeaderIncludes(CI.getLangOpts(), CI.getFileManager(),
CI.getPreprocessor().getHeaderSearchInfo().getModuleMap(),
Module, HeaderContents);
if (UmbrellaHeader && HeaderContents.empty()) {
// Simple case: we have an umbrella header and there are no additional
// includes, we can just parse the umbrella header directly.
setCurrentInput(FrontendInputFile(UmbrellaHeader->getName(),
getCurrentFileKind(),
Module->IsSystem));
return true;
}
FileManager &FileMgr = CI.getFileManager();
SmallString<128> HeaderName;
time_t ModTime;
if (UmbrellaHeader) {
// Read in the umbrella header.
// FIXME: Go through the source manager; the umbrella header may have
// been overridden.
std::string ErrorStr;
llvm::MemoryBuffer *UmbrellaContents
= FileMgr.getBufferForFile(UmbrellaHeader, &ErrorStr);
if (!UmbrellaContents) {
CI.getDiagnostics().Report(diag::err_missing_umbrella_header)
<< UmbrellaHeader->getName() << ErrorStr;
return false;
}
// Combine the contents of the umbrella header with the automatically-
// generated includes.
SmallString<256> OldContents = HeaderContents;
HeaderContents = UmbrellaContents->getBuffer();
HeaderContents += "\n\n";
HeaderContents += "/* Module includes */\n";
HeaderContents += OldContents;
// Pretend that we're parsing the umbrella header.
HeaderName = UmbrellaHeader->getName();
ModTime = UmbrellaHeader->getModificationTime();
delete UmbrellaContents;
} else {
// Pick an innocuous-sounding name for the umbrella header.
HeaderName = Module->Name + ".h";
if (FileMgr.getFile(HeaderName, /*OpenFile=*/false,
/*CacheFailure=*/false)) {
// Try again!
HeaderName = Module->Name + "-module.h";
if (FileMgr.getFile(HeaderName, /*OpenFile=*/false,
/*CacheFailure=*/false)) {
// Pick something ridiculous and go with it.
HeaderName = Module->Name + "-module.hmod";
}
}
ModTime = time(0);
}
// Remap the contents of the header name we're using to our synthesized
// buffer.
const FileEntry *HeaderFile = FileMgr.getVirtualFile(HeaderName,
HeaderContents.size(),
ModTime);
llvm::MemoryBuffer *HeaderContentsBuf
= llvm::MemoryBuffer::getMemBufferCopy(HeaderContents);
CI.getSourceManager().overrideFileContents(HeaderFile, HeaderContentsBuf);
setCurrentInput(FrontendInputFile(HeaderName, 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();
SmallString<256> ModuleFileName(HS.getModuleCachePath());
llvm::sys::path::append(ModuleFileName,
CI.getLangOpts().CurrentModule + ".pcm");
CI.getFrontendOpts().OutputFile = ModuleFileName.str();
}
// 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();
}
namespace {
class PubnamesDumpConsumer : public ASTConsumer {
Preprocessor &PP;
/// \brief Determine whether the given identifier provides a 'public' name.
bool isPublicName(IdentifierInfo *II) {
// If there are any top-level declarations associated with this
// identifier, it is a public name.
if (II->getFETokenInfo<void>())
return true;
// If this identifier is the name of a non-builtin macro that isn't
// defined on the command line or implicitly by the front end, it is a
// public name.
if (II->hasMacroDefinition()) {
if (MacroInfo *M = PP.getMacroInfo(II))
if (!M->isBuiltinMacro()) {
SourceLocation Loc = M->getDefinitionLoc();
FileID File = PP.getSourceManager().getFileID(Loc);
if (PP.getSourceManager().getFileEntryForID(File))
return true;
}
}
return false;
}
public:
PubnamesDumpConsumer(Preprocessor &PP) : PP(PP) { }
virtual void HandleTranslationUnit(ASTContext &Ctx) {
std::set<StringRef> Pubnames;
// Add the names of any non-builtin macros.
for (IdentifierTable::iterator I = Ctx.Idents.begin(),
IEnd = Ctx.Idents.end();
I != IEnd; ++I) {
if (isPublicName(I->second))
Pubnames.insert(I->first());
}
// If there is an external identifier lookup source, consider those
// identifiers as well.
if (IdentifierInfoLookup *External
= Ctx.Idents.getExternalIdentifierLookup()) {
OwningPtr<IdentifierIterator> Iter(External->getIdentifiers());
do {
StringRef Name = Iter->Next();
if (Name.empty())
break;
if (isPublicName(PP.getIdentifierInfo(Name)))
Pubnames.insert(Name);
} while (true);
}
// Print the names, in lexicographical order.
for (std::set<StringRef>::iterator N = Pubnames.begin(),
NEnd = Pubnames.end();
N != NEnd; ++N) {
llvm::outs() << *N << '\n';
}
}
};
}
ASTConsumer *PubnamesDumpAction::CreateASTConsumer(CompilerInstance &CI,
StringRef InFile) {
return new PubnamesDumpConsumer(CI.getPreprocessor());
}
//===----------------------------------------------------------------------===//
// 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.AddPragmaHandler(new EmptyPragmaHandler());
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;
}
}