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//===--- Tooling.cpp - Running clang standalone tools ---------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements functions to run clang tools standalone instead
// of running them as a plugin.
//
//===----------------------------------------------------------------------===//
#include "clang/Tooling/Tooling.h"
#include "clang/Driver/Compilation.h"
#include "clang/Driver/Driver.h"
#include "clang/Driver/Tool.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Frontend/FrontendDiagnostic.h"
#include "clang/Frontend/TextDiagnosticPrinter.h"
#include "clang/Tooling/ArgumentsAdjusters.h"
#include "clang/Tooling/CompilationDatabase.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Host.h"
#include "llvm/Support/raw_ostream.h"
// For chdir, see the comment in ClangTool::run for more information.
#ifdef _WIN32
# include <direct.h>
#else
# include <unistd.h>
#endif
namespace clang {
namespace tooling {
FrontendActionFactory::~FrontendActionFactory() {}
// FIXME: This file contains structural duplication with other parts of the
// code that sets up a compiler to run tools on it, and we should refactor
// it to be based on the same framework.
/// \brief Builds a clang driver initialized for running clang tools.
static clang::driver::Driver *newDriver(clang::DiagnosticsEngine *Diagnostics,
const char *BinaryName) {
const std::string DefaultOutputName = "a.out";
clang::driver::Driver *CompilerDriver = new clang::driver::Driver(
BinaryName, llvm::sys::getDefaultTargetTriple(),
DefaultOutputName, *Diagnostics);
CompilerDriver->setTitle("clang_based_tool");
return CompilerDriver;
}
/// \brief Retrieves the clang CC1 specific flags out of the compilation's jobs.
///
/// Returns NULL on error.
static const clang::driver::ArgStringList *getCC1Arguments(
clang::DiagnosticsEngine *Diagnostics,
clang::driver::Compilation *Compilation) {
// We expect to get back exactly one Command job, if we didn't something
// failed. Extract that job from the Compilation.
const clang::driver::JobList &Jobs = Compilation->getJobs();
if (Jobs.size() != 1 || !isa<clang::driver::Command>(*Jobs.begin())) {
SmallString<256> error_msg;
llvm::raw_svector_ostream error_stream(error_msg);
Compilation->PrintJob(error_stream, Compilation->getJobs(), "; ", true);
Diagnostics->Report(clang::diag::err_fe_expected_compiler_job)
<< error_stream.str();
return NULL;
}
// The one job we find should be to invoke clang again.
const clang::driver::Command *Cmd =
cast<clang::driver::Command>(*Jobs.begin());
if (StringRef(Cmd->getCreator().getName()) != "clang") {
Diagnostics->Report(clang::diag::err_fe_expected_clang_command);
return NULL;
}
return &Cmd->getArguments();
}
/// \brief Returns a clang build invocation initialized from the CC1 flags.
static clang::CompilerInvocation *newInvocation(
clang::DiagnosticsEngine *Diagnostics,
const clang::driver::ArgStringList &CC1Args) {
assert(!CC1Args.empty() && "Must at least contain the program name!");
clang::CompilerInvocation *Invocation = new clang::CompilerInvocation;
clang::CompilerInvocation::CreateFromArgs(
*Invocation, CC1Args.data() + 1, CC1Args.data() + CC1Args.size(),
*Diagnostics);
Invocation->getFrontendOpts().DisableFree = false;
return Invocation;
}
bool runToolOnCode(clang::FrontendAction *ToolAction, const Twine &Code,
const Twine &FileName) {
return runToolOnCodeWithArgs(
ToolAction, Code, std::vector<std::string>(), FileName);
}
bool runToolOnCodeWithArgs(clang::FrontendAction *ToolAction, const Twine &Code,
const std::vector<std::string> &Args,
const Twine &FileName) {
SmallString<16> FileNameStorage;
StringRef FileNameRef = FileName.toNullTerminatedStringRef(FileNameStorage);
std::vector<std::string> Commands;
Commands.push_back("clang-tool");
Commands.push_back("-fsyntax-only");
Commands.insert(Commands.end(), Args.begin(), Args.end());
Commands.push_back(FileNameRef.data());
FileManager Files((FileSystemOptions()));
ToolInvocation Invocation(Commands, ToolAction, &Files);
SmallString<1024> CodeStorage;
Invocation.mapVirtualFile(FileNameRef,
Code.toNullTerminatedStringRef(CodeStorage));
return Invocation.run();
}
std::string getAbsolutePath(StringRef File) {
SmallString<1024> BaseDirectory;
if (const char *PWD = ::getenv("PWD"))
BaseDirectory = PWD;
else
llvm::sys::fs::current_path(BaseDirectory);
SmallString<1024> PathStorage;
if (llvm::sys::path::is_absolute(File)) {
llvm::sys::path::native(File, PathStorage);
return PathStorage.str();
}
StringRef RelativePath(File);
// FIXME: Should '.\\' be accepted on Win32?
if (RelativePath.startswith("./")) {
RelativePath = RelativePath.substr(strlen("./"));
}
SmallString<1024> AbsolutePath(BaseDirectory);
llvm::sys::path::append(AbsolutePath, RelativePath);
llvm::sys::path::native(Twine(AbsolutePath), PathStorage);
return PathStorage.str();
}
ToolInvocation::ToolInvocation(
ArrayRef<std::string> CommandLine, FrontendAction *ToolAction,
FileManager *Files)
: CommandLine(CommandLine.vec()), ToolAction(ToolAction), Files(Files) {
}
void ToolInvocation::mapVirtualFile(StringRef FilePath, StringRef Content) {
SmallString<1024> PathStorage;
llvm::sys::path::native(FilePath, PathStorage);
MappedFileContents[PathStorage] = Content;
}
bool ToolInvocation::run() {
std::vector<const char*> Argv;
for (int I = 0, E = CommandLine.size(); I != E; ++I)
Argv.push_back(CommandLine[I].c_str());
const char *const BinaryName = Argv[0];
IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts = new DiagnosticOptions();
TextDiagnosticPrinter DiagnosticPrinter(
llvm::errs(), &*DiagOpts);
DiagnosticsEngine Diagnostics(
IntrusiveRefCntPtr<clang::DiagnosticIDs>(new DiagnosticIDs()),
&*DiagOpts, &DiagnosticPrinter, false);
const OwningPtr<clang::driver::Driver> Driver(
newDriver(&Diagnostics, BinaryName));
// Since the input might only be virtual, don't check whether it exists.
Driver->setCheckInputsExist(false);
const OwningPtr<clang::driver::Compilation> Compilation(
Driver->BuildCompilation(llvm::makeArrayRef(Argv)));
const clang::driver::ArgStringList *const CC1Args = getCC1Arguments(
&Diagnostics, Compilation.get());
if (CC1Args == NULL) {
return false;
}
OwningPtr<clang::CompilerInvocation> Invocation(
newInvocation(&Diagnostics, *CC1Args));
return runInvocation(BinaryName, Compilation.get(), Invocation.take());
}
bool ToolInvocation::runInvocation(
const char *BinaryName,
clang::driver::Compilation *Compilation,
clang::CompilerInvocation *Invocation) {
// Show the invocation, with -v.
if (Invocation->getHeaderSearchOpts().Verbose) {
llvm::errs() << "clang Invocation:\n";
Compilation->PrintJob(llvm::errs(), Compilation->getJobs(), "\n", true);
llvm::errs() << "\n";
}
// Create a compiler instance to handle the actual work.
clang::CompilerInstance Compiler;
Compiler.setInvocation(Invocation);
Compiler.setFileManager(Files);
// FIXME: What about LangOpts?
// ToolAction can have lifetime requirements for Compiler or its members, and
// we need to ensure it's deleted earlier than Compiler. So we pass it to an
// OwningPtr declared after the Compiler variable.
OwningPtr<FrontendAction> ScopedToolAction(ToolAction.take());
// Create the compilers actual diagnostics engine.
Compiler.createDiagnostics();
if (!Compiler.hasDiagnostics())
return false;
Compiler.createSourceManager(*Files);
addFileMappingsTo(Compiler.getSourceManager());
const bool Success = Compiler.ExecuteAction(*ScopedToolAction);
Compiler.resetAndLeakFileManager();
Files->clearStatCaches();
return Success;
}
void ToolInvocation::addFileMappingsTo(SourceManager &Sources) {
for (llvm::StringMap<StringRef>::const_iterator
It = MappedFileContents.begin(), End = MappedFileContents.end();
It != End; ++It) {
// Inject the code as the given file name into the preprocessor options.
const llvm::MemoryBuffer *Input =
llvm::MemoryBuffer::getMemBuffer(It->getValue());
// FIXME: figure out what '0' stands for.
const FileEntry *FromFile = Files->getVirtualFile(
It->getKey(), Input->getBufferSize(), 0);
Sources.overrideFileContents(FromFile, Input);
}
}
ClangTool::ClangTool(const CompilationDatabase &Compilations,
ArrayRef<std::string> SourcePaths)
: Files((FileSystemOptions())),
ArgsAdjuster(new ClangSyntaxOnlyAdjuster()) {
for (unsigned I = 0, E = SourcePaths.size(); I != E; ++I) {
SmallString<1024> File(getAbsolutePath(SourcePaths[I]));
std::vector<CompileCommand> CompileCommandsForFile =
Compilations.getCompileCommands(File.str());
if (!CompileCommandsForFile.empty()) {
for (int I = 0, E = CompileCommandsForFile.size(); I != E; ++I) {
CompileCommands.push_back(std::make_pair(File.str(),
CompileCommandsForFile[I]));
}
} else {
// FIXME: There are two use cases here: doing a fuzzy
// "find . -name '*.cc' |xargs tool" match, where as a user I don't care
// about the .cc files that were not found, and the use case where I
// specify all files I want to run over explicitly, where this should
// be an error. We'll want to add an option for this.
llvm::outs() << "Skipping " << File << ". Command line not found.\n";
}
}
}
void ClangTool::mapVirtualFile(StringRef FilePath, StringRef Content) {
MappedFileContents.push_back(std::make_pair(FilePath, Content));
}
void ClangTool::setArgumentsAdjuster(ArgumentsAdjuster *Adjuster) {
ArgsAdjuster.reset(Adjuster);
}
int ClangTool::run(FrontendActionFactory *ActionFactory) {
// Exists solely for the purpose of lookup of the resource path.
// This just needs to be some symbol in the binary.
static int StaticSymbol;
// The driver detects the builtin header path based on the path of the
// executable.
// FIXME: On linux, GetMainExecutable is independent of the value of the
// first argument, thus allowing ClangTool and runToolOnCode to just
// pass in made-up names here. Make sure this works on other platforms.
std::string MainExecutable =
llvm::sys::Path::GetMainExecutable("clang_tool", &StaticSymbol).str();
bool ProcessingFailed = false;
for (unsigned I = 0; I < CompileCommands.size(); ++I) {
std::string File = CompileCommands[I].first;
// FIXME: chdir is thread hostile; on the other hand, creating the same
// behavior as chdir is complex: chdir resolves the path once, thus
// guaranteeing that all subsequent relative path operations work
// on the same path the original chdir resulted in. This makes a difference
// for example on network filesystems, where symlinks might be switched
// during runtime of the tool. Fixing this depends on having a file system
// abstraction that allows openat() style interactions.
if (chdir(CompileCommands[I].second.Directory.c_str()))
llvm::report_fatal_error("Cannot chdir into \"" +
CompileCommands[I].second.Directory + "\n!");
std::vector<std::string> CommandLine =
ArgsAdjuster->Adjust(CompileCommands[I].second.CommandLine);
assert(!CommandLine.empty());
CommandLine[0] = MainExecutable;
// FIXME: We need a callback mechanism for the tool writer to output a
// customized message for each file.
DEBUG({
llvm::dbgs() << "Processing: " << File << ".\n";
});
ToolInvocation Invocation(CommandLine, ActionFactory->create(), &Files);
for (int I = 0, E = MappedFileContents.size(); I != E; ++I) {
Invocation.mapVirtualFile(MappedFileContents[I].first,
MappedFileContents[I].second);
}
if (!Invocation.run()) {
// FIXME: Diagnostics should be used instead.
llvm::errs() << "Error while processing " << File << ".\n";
ProcessingFailed = true;
}
}
return ProcessingFailed ? 1 : 0;
}
} // end namespace tooling
} // end namespace clang