diff options
Diffstat (limited to 'contrib/llvm/tools/clang/lib/Tooling/Tooling.cpp')
| -rw-r--r-- | contrib/llvm/tools/clang/lib/Tooling/Tooling.cpp | 319 |
1 files changed, 319 insertions, 0 deletions
diff --git a/contrib/llvm/tools/clang/lib/Tooling/Tooling.cpp b/contrib/llvm/tools/clang/lib/Tooling/Tooling.cpp new file mode 100644 index 0000000..52855f6 --- /dev/null +++ b/contrib/llvm/tools/clang/lib/Tooling/Tooling.cpp @@ -0,0 +1,319 @@ +//===--- 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 |
