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llvm-project/clang/lib/Tooling/Tooling.cpp

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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/Basic/Diagnostic.h"
#include "clang/Basic/DiagnosticIDs.h"
#include "clang/Basic/DiagnosticOptions.h"
#include "clang/Basic/FileManager.h"
#include "clang/Basic/FileSystemOptions.h"
#include "clang/Basic/LLVM.h"
#include "clang/Driver/Compilation.h"
#include "clang/Driver/Driver.h"
#include "clang/Driver/Job.h"
#include "clang/Driver/Options.h"
#include "clang/Driver/Tool.h"
#include "clang/Driver/ToolChain.h"
#include "clang/Frontend/ASTUnit.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Frontend/CompilerInvocation.h"
#include "clang/Frontend/FrontendDiagnostic.h"
#include "clang/Frontend/FrontendOptions.h"
#include "clang/Frontend/TextDiagnosticPrinter.h"
#include "clang/Lex/HeaderSearchOptions.h"
#include "clang/Lex/PreprocessorOptions.h"
#include "clang/Tooling/ArgumentsAdjusters.h"
#include "clang/Tooling/CompilationDatabase.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/IntrusiveRefCntPtr.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Option/ArgList.h"
#include "llvm/Option/OptTable.h"
#include "llvm/Option/Option.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Host.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/VirtualFileSystem.h"
#include "llvm/Support/raw_ostream.h"
#include <cassert>
#include <cstring>
#include <memory>
#include <string>
#include <system_error>
#include <utility>
#include <vector>
#define DEBUG_TYPE "clang-tooling"
using namespace clang;
using namespace tooling;
ToolAction::~ToolAction() = default;
FrontendActionFactory::~FrontendActionFactory() = default;
// 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.
/// Builds a clang driver initialized for running clang tools.
static driver::Driver *
newDriver(DiagnosticsEngine *Diagnostics, const char *BinaryName,
IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS) {
driver::Driver *CompilerDriver =
new driver::Driver(BinaryName, llvm::sys::getDefaultTargetTriple(),
*Diagnostics, std::move(VFS));
CompilerDriver->setTitle("clang_based_tool");
return CompilerDriver;
}
/// Retrieves the clang CC1 specific flags out of the compilation's jobs.
///
/// Returns nullptr on error.
static const llvm::opt::ArgStringList *getCC1Arguments(
DiagnosticsEngine *Diagnostics, 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 driver::JobList &Jobs = Compilation->getJobs();
if (Jobs.size() != 1 || !isa<driver::Command>(*Jobs.begin())) {
SmallString<256> error_msg;
llvm::raw_svector_ostream error_stream(error_msg);
Jobs.Print(error_stream, "; ", true);
Diagnostics->Report(diag::err_fe_expected_compiler_job)
<< error_stream.str();
return nullptr;
}
// The one job we find should be to invoke clang again.
const auto &Cmd = cast<driver::Command>(*Jobs.begin());
if (StringRef(Cmd.getCreator().getName()) != "clang") {
Diagnostics->Report(diag::err_fe_expected_clang_command);
return nullptr;
}
return &Cmd.getArguments();
}
namespace clang {
namespace tooling {
/// Returns a clang build invocation initialized from the CC1 flags.
CompilerInvocation *newInvocation(
DiagnosticsEngine *Diagnostics, const llvm::opt::ArgStringList &CC1Args) {
assert(!CC1Args.empty() && "Must at least contain the program name!");
CompilerInvocation *Invocation = new CompilerInvocation;
CompilerInvocation::CreateFromArgs(
*Invocation, CC1Args.data() + 1, CC1Args.data() + CC1Args.size(),
*Diagnostics);
Invocation->getFrontendOpts().DisableFree = false;
Invocation->getCodeGenOpts().DisableFree = false;
return Invocation;
}
bool runToolOnCode(FrontendAction *ToolAction, const Twine &Code,
const Twine &FileName,
std::shared_ptr<PCHContainerOperations> PCHContainerOps) {
return runToolOnCodeWithArgs(ToolAction, Code, std::vector<std::string>(),
FileName, "clang-tool",
std::move(PCHContainerOps));
}
} // namespace tooling
} // namespace clang
static std::vector<std::string>
getSyntaxOnlyToolArgs(const Twine &ToolName,
const std::vector<std::string> &ExtraArgs,
StringRef FileName) {
std::vector<std::string> Args;
Args.push_back(ToolName.str());
Args.push_back("-fsyntax-only");
Args.insert(Args.end(), ExtraArgs.begin(), ExtraArgs.end());
Args.push_back(FileName.str());
return Args;
}
namespace clang {
namespace tooling {
bool runToolOnCodeWithArgs(
FrontendAction *ToolAction, const Twine &Code,
llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS,
const std::vector<std::string> &Args, const Twine &FileName,
const Twine &ToolName,
std::shared_ptr<PCHContainerOperations> PCHContainerOps) {
SmallString<16> FileNameStorage;
StringRef FileNameRef = FileName.toNullTerminatedStringRef(FileNameStorage);
llvm::IntrusiveRefCntPtr<FileManager> Files(
new FileManager(FileSystemOptions(), VFS));
ArgumentsAdjuster Adjuster = getClangStripDependencyFileAdjuster();
ToolInvocation Invocation(
getSyntaxOnlyToolArgs(ToolName, Adjuster(Args, FileNameRef), FileNameRef),
ToolAction, Files.get(),
std::move(PCHContainerOps));
return Invocation.run();
}
bool runToolOnCodeWithArgs(
FrontendAction *ToolAction, const Twine &Code,
const std::vector<std::string> &Args, const Twine &FileName,
const Twine &ToolName,
std::shared_ptr<PCHContainerOperations> PCHContainerOps,
const FileContentMappings &VirtualMappedFiles) {
llvm::IntrusiveRefCntPtr<llvm::vfs::OverlayFileSystem> OverlayFileSystem(
new llvm::vfs::OverlayFileSystem(llvm::vfs::getRealFileSystem()));
llvm::IntrusiveRefCntPtr<llvm::vfs::InMemoryFileSystem> InMemoryFileSystem(
new llvm::vfs::InMemoryFileSystem);
OverlayFileSystem->pushOverlay(InMemoryFileSystem);
SmallString<1024> CodeStorage;
InMemoryFileSystem->addFile(FileName, 0,
llvm::MemoryBuffer::getMemBuffer(
Code.toNullTerminatedStringRef(CodeStorage)));
for (auto &FilenameWithContent : VirtualMappedFiles) {
InMemoryFileSystem->addFile(
FilenameWithContent.first, 0,
llvm::MemoryBuffer::getMemBuffer(FilenameWithContent.second));
}
return runToolOnCodeWithArgs(ToolAction, Code, OverlayFileSystem, Args,
FileName, ToolName);
}
llvm::Expected<std::string> getAbsolutePath(llvm::vfs::FileSystem &FS,
StringRef File) {
StringRef RelativePath(File);
// FIXME: Should '.\\' be accepted on Win32?
if (RelativePath.startswith("./")) {
RelativePath = RelativePath.substr(strlen("./"));
}
SmallString<1024> AbsolutePath = RelativePath;
if (auto EC = FS.makeAbsolute(AbsolutePath))
return llvm::errorCodeToError(EC);
llvm::sys::path::native(AbsolutePath);
return AbsolutePath.str();
}
std::string getAbsolutePath(StringRef File) {
return llvm::cantFail(getAbsolutePath(*llvm::vfs::getRealFileSystem(), File));
}
void addTargetAndModeForProgramName(std::vector<std::string> &CommandLine,
StringRef InvokedAs) {
if (!CommandLine.empty() && !InvokedAs.empty()) {
bool AlreadyHasTarget = false;
bool AlreadyHasMode = false;
// Skip CommandLine[0].
for (auto Token = ++CommandLine.begin(); Token != CommandLine.end();
++Token) {
StringRef TokenRef(*Token);
AlreadyHasTarget |=
(TokenRef == "-target" || TokenRef.startswith("-target="));
AlreadyHasMode |= (TokenRef == "--driver-mode" ||
TokenRef.startswith("--driver-mode="));
}
auto TargetMode =
driver::ToolChain::getTargetAndModeFromProgramName(InvokedAs);
if (!AlreadyHasMode && TargetMode.DriverMode) {
CommandLine.insert(++CommandLine.begin(), TargetMode.DriverMode);
}
if (!AlreadyHasTarget && TargetMode.TargetIsValid) {
CommandLine.insert(++CommandLine.begin(), {"-target",
TargetMode.TargetPrefix});
}
}
}
} // namespace tooling
} // namespace clang
namespace {
class SingleFrontendActionFactory : public FrontendActionFactory {
FrontendAction *Action;
public:
SingleFrontendActionFactory(FrontendAction *Action) : Action(Action) {}
FrontendAction *create() override { return Action; }
};
} // namespace
ToolInvocation::ToolInvocation(
std::vector<std::string> CommandLine, ToolAction *Action,
FileManager *Files, std::shared_ptr<PCHContainerOperations> PCHContainerOps)
: CommandLine(std::move(CommandLine)), Action(Action), OwnsAction(false),
Files(Files), PCHContainerOps(std::move(PCHContainerOps)) {}
ToolInvocation::ToolInvocation(
std::vector<std::string> CommandLine, FrontendAction *FAction,
FileManager *Files, std::shared_ptr<PCHContainerOperations> PCHContainerOps)
: CommandLine(std::move(CommandLine)),
Action(new SingleFrontendActionFactory(FAction)), OwnsAction(true),
Files(Files), PCHContainerOps(std::move(PCHContainerOps)) {}
ToolInvocation::~ToolInvocation() {
if (OwnsAction)
delete Action;
}
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 (const std::string &Str : CommandLine)
Argv.push_back(Str.c_str());
const char *const BinaryName = Argv[0];
IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts = new DiagnosticOptions();
unsigned MissingArgIndex, MissingArgCount;
std::unique_ptr<llvm::opt::OptTable> Opts = driver::createDriverOptTable();
llvm::opt::InputArgList ParsedArgs = Opts->ParseArgs(
ArrayRef<const char *>(Argv).slice(1), MissingArgIndex, MissingArgCount);
ParseDiagnosticArgs(*DiagOpts, ParsedArgs);
TextDiagnosticPrinter DiagnosticPrinter(
llvm::errs(), &*DiagOpts);
DiagnosticsEngine Diagnostics(
IntrusiveRefCntPtr<DiagnosticIDs>(new DiagnosticIDs()), &*DiagOpts,
DiagConsumer ? DiagConsumer : &DiagnosticPrinter, false);
const std::unique_ptr<driver::Driver> Driver(
newDriver(&Diagnostics, BinaryName, Files->getVirtualFileSystem()));
// The "input file not found" diagnostics from the driver are useful.
// The driver is only aware of the VFS working directory, but some clients
// change this at the FileManager level instead.
// In this case the checks have false positives, so skip them.
if (!Files->getFileSystemOpts().WorkingDir.empty())
Driver->setCheckInputsExist(false);
const std::unique_ptr<driver::Compilation> Compilation(
Driver->BuildCompilation(llvm::makeArrayRef(Argv)));
if (!Compilation)
return false;
const llvm::opt::ArgStringList *const CC1Args = getCC1Arguments(
&Diagnostics, Compilation.get());
if (!CC1Args)
return false;
std::unique_ptr<CompilerInvocation> Invocation(
newInvocation(&Diagnostics, *CC1Args));
// FIXME: remove this when all users have migrated!
for (const auto &It : MappedFileContents) {
// Inject the code as the given file name into the preprocessor options.
std::unique_ptr<llvm::MemoryBuffer> Input =
llvm::MemoryBuffer::getMemBuffer(It.getValue());
Invocation->getPreprocessorOpts().addRemappedFile(It.getKey(),
Input.release());
}
return runInvocation(BinaryName, Compilation.get(), std::move(Invocation),
std::move(PCHContainerOps));
}
bool ToolInvocation::runInvocation(
const char *BinaryName, driver::Compilation *Compilation,
std::shared_ptr<CompilerInvocation> Invocation,
std::shared_ptr<PCHContainerOperations> PCHContainerOps) {
// Show the invocation, with -v.
if (Invocation->getHeaderSearchOpts().Verbose) {
llvm::errs() << "clang Invocation:\n";
Compilation->getJobs().Print(llvm::errs(), "\n", true);
llvm::errs() << "\n";
}
return Action->runInvocation(std::move(Invocation), Files,
std::move(PCHContainerOps), DiagConsumer);
}
bool FrontendActionFactory::runInvocation(
std::shared_ptr<CompilerInvocation> Invocation, FileManager *Files,
std::shared_ptr<PCHContainerOperations> PCHContainerOps,
DiagnosticConsumer *DiagConsumer) {
// Create a compiler instance to handle the actual work.
CompilerInstance Compiler(std::move(PCHContainerOps));
Compiler.setInvocation(std::move(Invocation));
Compiler.setFileManager(Files);
// The FrontendAction 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 std::unique_ptr declared after the Compiler variable.
std::unique_ptr<FrontendAction> ScopedToolAction(create());
// Create the compiler's actual diagnostics engine.
Compiler.createDiagnostics(DiagConsumer, /*ShouldOwnClient=*/false);
if (!Compiler.hasDiagnostics())
return false;
Compiler.createSourceManager(*Files);
const bool Success = Compiler.ExecuteAction(*ScopedToolAction);
Files->clearStatCache();
return Success;
}
ClangTool::ClangTool(const CompilationDatabase &Compilations,
ArrayRef<std::string> SourcePaths,
std::shared_ptr<PCHContainerOperations> PCHContainerOps,
IntrusiveRefCntPtr<llvm::vfs::FileSystem> BaseFS)
: Compilations(Compilations), SourcePaths(SourcePaths),
PCHContainerOps(std::move(PCHContainerOps)),
OverlayFileSystem(new llvm::vfs::OverlayFileSystem(std::move(BaseFS))),
InMemoryFileSystem(new llvm::vfs::InMemoryFileSystem),
Files(new FileManager(FileSystemOptions(), OverlayFileSystem)) {
OverlayFileSystem->pushOverlay(InMemoryFileSystem);
appendArgumentsAdjuster(getClangStripOutputAdjuster());
appendArgumentsAdjuster(getClangSyntaxOnlyAdjuster());
appendArgumentsAdjuster(getClangStripDependencyFileAdjuster());
}
ClangTool::~ClangTool() = default;
void ClangTool::mapVirtualFile(StringRef FilePath, StringRef Content) {
MappedFileContents.push_back(std::make_pair(FilePath, Content));
}
void ClangTool::appendArgumentsAdjuster(ArgumentsAdjuster Adjuster) {
ArgsAdjuster = combineAdjusters(std::move(ArgsAdjuster), std::move(Adjuster));
}
void ClangTool::clearArgumentsAdjusters() {
ArgsAdjuster = nullptr;
}
static void injectResourceDir(CommandLineArguments &Args, const char *Argv0,
void *MainAddr) {
// Allow users to override the resource dir.
for (StringRef Arg : Args)
if (Arg.startswith("-resource-dir"))
return;
// If there's no override in place add our resource dir.
Args.push_back("-resource-dir=" +
CompilerInvocation::GetResourcesPath(Argv0, MainAddr));
}
int ClangTool::run(ToolAction *Action) {
// Exists solely for the purpose of lookup of the resource path.
// This just needs to be some symbol in the binary.
static int StaticSymbol;
// First insert all absolute paths into the in-memory VFS. These are global
// for all compile commands.
if (SeenWorkingDirectories.insert("/").second)
for (const auto &MappedFile : MappedFileContents)
if (llvm::sys::path::is_absolute(MappedFile.first))
InMemoryFileSystem->addFile(
MappedFile.first, 0,
llvm::MemoryBuffer::getMemBuffer(MappedFile.second));
bool ProcessingFailed = false;
bool FileSkipped = false;
// Compute all absolute paths before we run any actions, as those will change
// the working directory.
std::vector<std::string> AbsolutePaths;
AbsolutePaths.reserve(SourcePaths.size());
for (const auto &SourcePath : SourcePaths) {
auto AbsPath = getAbsolutePath(*OverlayFileSystem, SourcePath);
if (!AbsPath) {
llvm::errs() << "Skipping " << SourcePath
<< ". Error while getting an absolute path: "
<< llvm::toString(AbsPath.takeError()) << "\n";
continue;
}
AbsolutePaths.push_back(std::move(*AbsPath));
}
// Remember the working directory in case we need to restore it.
std::string InitialWorkingDir;
if (RestoreCWD) {
if (auto CWD = OverlayFileSystem->getCurrentWorkingDirectory()) {
InitialWorkingDir = std::move(*CWD);
} else {
llvm::errs() << "Could not get working directory: "
<< CWD.getError().message() << "\n";
}
}
for (llvm::StringRef File : AbsolutePaths) {
// Currently implementations of CompilationDatabase::getCompileCommands can
// change the state of the file system (e.g. prepare generated headers), so
// this method needs to run right before we invoke the tool, as the next
// file may require a different (incompatible) state of the file system.
//
// FIXME: Make the compilation database interface more explicit about the
// requirements to the order of invocation of its members.
std::vector<CompileCommand> CompileCommandsForFile =
Compilations.getCompileCommands(File);
if (CompileCommandsForFile.empty()) {
llvm::errs() << "Skipping " << File << ". Compile command not found.\n";
FileSkipped = true;
continue;
}
for (CompileCommand &CompileCommand : CompileCommandsForFile) {
// 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 (OverlayFileSystem->setCurrentWorkingDirectory(
CompileCommand.Directory))
llvm::report_fatal_error("Cannot chdir into \"" +
Twine(CompileCommand.Directory) + "\n!");
// Now fill the in-memory VFS with the relative file mappings so it will
// have the correct relative paths. We never remove mappings but that
// should be fine.
if (SeenWorkingDirectories.insert(CompileCommand.Directory).second)
for (const auto &MappedFile : MappedFileContents)
if (!llvm::sys::path::is_absolute(MappedFile.first))
InMemoryFileSystem->addFile(
MappedFile.first, 0,
llvm::MemoryBuffer::getMemBuffer(MappedFile.second));
std::vector<std::string> CommandLine = CompileCommand.CommandLine;
if (ArgsAdjuster)
CommandLine = ArgsAdjuster(CommandLine, CompileCommand.Filename);
assert(!CommandLine.empty());
// Add the resource dir based on the binary of this tool. argv[0] in the
// compilation database may refer to a different compiler and we want to
// pick up the very same standard library that compiler is using. The
// builtin headers in the resource dir need to match the exact clang
// version the tool is using.
// 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.
injectResourceDir(CommandLine, "clang_tool", &StaticSymbol);
// FIXME: We need a callback mechanism for the tool writer to output a
// customized message for each file.
LLVM_DEBUG({ llvm::dbgs() << "Processing: " << File << ".\n"; });
ToolInvocation Invocation(std::move(CommandLine), Action, Files.get(),
PCHContainerOps);
Invocation.setDiagnosticConsumer(DiagConsumer);
if (!Invocation.run()) {
// FIXME: Diagnostics should be used instead.
llvm::errs() << "Error while processing " << File << ".\n";
ProcessingFailed = true;
}
}
}
if (!InitialWorkingDir.empty()) {
if (auto EC =
OverlayFileSystem->setCurrentWorkingDirectory(InitialWorkingDir))
llvm::errs() << "Error when trying to restore working dir: "
<< EC.message() << "\n";
}
return ProcessingFailed ? 1 : (FileSkipped ? 2 : 0);
}
namespace {
class ASTBuilderAction : public ToolAction {
std::vector<std::unique_ptr<ASTUnit>> &ASTs;
public:
ASTBuilderAction(std::vector<std::unique_ptr<ASTUnit>> &ASTs) : ASTs(ASTs) {}
bool runInvocation(std::shared_ptr<CompilerInvocation> Invocation,
FileManager *Files,
std::shared_ptr<PCHContainerOperations> PCHContainerOps,
DiagnosticConsumer *DiagConsumer) override {
std::unique_ptr<ASTUnit> AST = ASTUnit::LoadFromCompilerInvocation(
Invocation, std::move(PCHContainerOps),
CompilerInstance::createDiagnostics(&Invocation->getDiagnosticOpts(),
DiagConsumer,
/*ShouldOwnClient=*/false),
Files);
if (!AST)
return false;
ASTs.push_back(std::move(AST));
return true;
}
};
} // namespace
int ClangTool::buildASTs(std::vector<std::unique_ptr<ASTUnit>> &ASTs) {
ASTBuilderAction Action(ASTs);
return run(&Action);
}
void ClangTool::setRestoreWorkingDir(bool RestoreCWD) {
this->RestoreCWD = RestoreCWD;
}
namespace clang {
namespace tooling {
std::unique_ptr<ASTUnit>
buildASTFromCode(StringRef Code, StringRef FileName,
std::shared_ptr<PCHContainerOperations> PCHContainerOps) {
return buildASTFromCodeWithArgs(Code, std::vector<std::string>(), FileName,
"clang-tool", std::move(PCHContainerOps));
}
std::unique_ptr<ASTUnit> buildASTFromCodeWithArgs(
StringRef Code, const std::vector<std::string> &Args, StringRef FileName,
StringRef ToolName, std::shared_ptr<PCHContainerOperations> PCHContainerOps,
ArgumentsAdjuster Adjuster) {
std::vector<std::unique_ptr<ASTUnit>> ASTs;
ASTBuilderAction Action(ASTs);
llvm::IntrusiveRefCntPtr<llvm::vfs::OverlayFileSystem> OverlayFileSystem(
new llvm::vfs::OverlayFileSystem(llvm::vfs::getRealFileSystem()));
llvm::IntrusiveRefCntPtr<llvm::vfs::InMemoryFileSystem> InMemoryFileSystem(
new llvm::vfs::InMemoryFileSystem);
OverlayFileSystem->pushOverlay(InMemoryFileSystem);
llvm::IntrusiveRefCntPtr<FileManager> Files(
new FileManager(FileSystemOptions(), OverlayFileSystem));
ToolInvocation Invocation(
getSyntaxOnlyToolArgs(ToolName, Adjuster(Args, FileName), FileName),
&Action, Files.get(), std::move(PCHContainerOps));
InMemoryFileSystem->addFile(FileName, 0,
llvm::MemoryBuffer::getMemBufferCopy(Code));
if (!Invocation.run())
return nullptr;
assert(ASTs.size() == 1);
return std::move(ASTs[0]);
}
} // namespace tooling
} // namespace clang
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