forked from OSchip/llvm-project
545 lines
22 KiB
C++
545 lines
22 KiB
C++
//===--- Tooling.cpp - Running clang standalone tools ---------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements functions to run clang tools standalone instead
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// of running them as a plugin.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Tooling/Tooling.h"
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#include "clang/Driver/Compilation.h"
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#include "clang/Driver/Driver.h"
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#include "clang/Driver/Options.h"
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#include "clang/Driver/Tool.h"
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#include "clang/Driver/ToolChain.h"
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#include "clang/Frontend/ASTUnit.h"
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#include "clang/Frontend/CompilerInstance.h"
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#include "clang/Frontend/FrontendDiagnostic.h"
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#include "clang/Frontend/TextDiagnosticPrinter.h"
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#include "clang/Lex/PreprocessorOptions.h"
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#include "clang/Tooling/ArgumentsAdjusters.h"
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#include "clang/Tooling/CompilationDatabase.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/Config/llvm-config.h"
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#include "llvm/Option/ArgList.h"
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#include "llvm/Option/Option.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/Host.h"
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#include "llvm/Support/Path.h"
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#include "llvm/Support/raw_ostream.h"
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#include <utility>
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#define DEBUG_TYPE "clang-tooling"
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namespace clang {
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namespace tooling {
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ToolAction::~ToolAction() {}
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FrontendActionFactory::~FrontendActionFactory() {}
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// FIXME: This file contains structural duplication with other parts of the
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// code that sets up a compiler to run tools on it, and we should refactor
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// it to be based on the same framework.
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/// \brief Builds a clang driver initialized for running clang tools.
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static clang::driver::Driver *newDriver(
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clang::DiagnosticsEngine *Diagnostics, const char *BinaryName,
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IntrusiveRefCntPtr<vfs::FileSystem> VFS) {
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clang::driver::Driver *CompilerDriver =
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new clang::driver::Driver(BinaryName, llvm::sys::getDefaultTargetTriple(),
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*Diagnostics, std::move(VFS));
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CompilerDriver->setTitle("clang_based_tool");
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return CompilerDriver;
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}
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/// \brief Retrieves the clang CC1 specific flags out of the compilation's jobs.
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///
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/// Returns NULL on error.
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static const llvm::opt::ArgStringList *getCC1Arguments(
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clang::DiagnosticsEngine *Diagnostics,
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clang::driver::Compilation *Compilation) {
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// We expect to get back exactly one Command job, if we didn't something
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// failed. Extract that job from the Compilation.
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const clang::driver::JobList &Jobs = Compilation->getJobs();
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if (Jobs.size() != 1 || !isa<clang::driver::Command>(*Jobs.begin())) {
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SmallString<256> error_msg;
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llvm::raw_svector_ostream error_stream(error_msg);
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Jobs.Print(error_stream, "; ", true);
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Diagnostics->Report(clang::diag::err_fe_expected_compiler_job)
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<< error_stream.str();
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return nullptr;
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}
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// The one job we find should be to invoke clang again.
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const clang::driver::Command &Cmd =
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cast<clang::driver::Command>(*Jobs.begin());
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if (StringRef(Cmd.getCreator().getName()) != "clang") {
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Diagnostics->Report(clang::diag::err_fe_expected_clang_command);
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return nullptr;
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}
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return &Cmd.getArguments();
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}
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/// \brief Returns a clang build invocation initialized from the CC1 flags.
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clang::CompilerInvocation *newInvocation(
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clang::DiagnosticsEngine *Diagnostics,
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const llvm::opt::ArgStringList &CC1Args) {
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assert(!CC1Args.empty() && "Must at least contain the program name!");
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clang::CompilerInvocation *Invocation = new clang::CompilerInvocation;
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clang::CompilerInvocation::CreateFromArgs(
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*Invocation, CC1Args.data() + 1, CC1Args.data() + CC1Args.size(),
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*Diagnostics);
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Invocation->getFrontendOpts().DisableFree = false;
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Invocation->getCodeGenOpts().DisableFree = false;
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return Invocation;
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}
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bool runToolOnCode(clang::FrontendAction *ToolAction, const Twine &Code,
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const Twine &FileName,
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std::shared_ptr<PCHContainerOperations> PCHContainerOps) {
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return runToolOnCodeWithArgs(ToolAction, Code, std::vector<std::string>(),
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FileName, "clang-tool",
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std::move(PCHContainerOps));
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}
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static std::vector<std::string>
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getSyntaxOnlyToolArgs(const Twine &ToolName,
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const std::vector<std::string> &ExtraArgs,
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StringRef FileName) {
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std::vector<std::string> Args;
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Args.push_back(ToolName.str());
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Args.push_back("-fsyntax-only");
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Args.insert(Args.end(), ExtraArgs.begin(), ExtraArgs.end());
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Args.push_back(FileName.str());
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return Args;
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}
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bool runToolOnCodeWithArgs(
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clang::FrontendAction *ToolAction, const Twine &Code,
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const std::vector<std::string> &Args, const Twine &FileName,
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const Twine &ToolName,
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std::shared_ptr<PCHContainerOperations> PCHContainerOps,
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const FileContentMappings &VirtualMappedFiles) {
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SmallString<16> FileNameStorage;
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StringRef FileNameRef = FileName.toNullTerminatedStringRef(FileNameStorage);
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llvm::IntrusiveRefCntPtr<vfs::OverlayFileSystem> OverlayFileSystem(
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new vfs::OverlayFileSystem(vfs::getRealFileSystem()));
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llvm::IntrusiveRefCntPtr<vfs::InMemoryFileSystem> InMemoryFileSystem(
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new vfs::InMemoryFileSystem);
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OverlayFileSystem->pushOverlay(InMemoryFileSystem);
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llvm::IntrusiveRefCntPtr<FileManager> Files(
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new FileManager(FileSystemOptions(), OverlayFileSystem));
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ArgumentsAdjuster Adjuster = getClangStripDependencyFileAdjuster();
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ToolInvocation Invocation(
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getSyntaxOnlyToolArgs(ToolName, Adjuster(Args, FileNameRef), FileNameRef),
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ToolAction, Files.get(),
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std::move(PCHContainerOps));
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SmallString<1024> CodeStorage;
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InMemoryFileSystem->addFile(FileNameRef, 0,
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llvm::MemoryBuffer::getMemBuffer(
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Code.toNullTerminatedStringRef(CodeStorage)));
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for (auto &FilenameWithContent : VirtualMappedFiles) {
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InMemoryFileSystem->addFile(
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FilenameWithContent.first, 0,
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llvm::MemoryBuffer::getMemBuffer(FilenameWithContent.second));
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}
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return Invocation.run();
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}
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std::string getAbsolutePath(StringRef File) {
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StringRef RelativePath(File);
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// FIXME: Should '.\\' be accepted on Win32?
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if (RelativePath.startswith("./")) {
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RelativePath = RelativePath.substr(strlen("./"));
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}
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SmallString<1024> AbsolutePath = RelativePath;
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std::error_code EC = llvm::sys::fs::make_absolute(AbsolutePath);
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assert(!EC);
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(void)EC;
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llvm::sys::path::native(AbsolutePath);
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return AbsolutePath.str();
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}
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void addTargetAndModeForProgramName(std::vector<std::string> &CommandLine,
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StringRef InvokedAs) {
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if (!CommandLine.empty() && !InvokedAs.empty()) {
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bool AlreadyHasTarget = false;
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bool AlreadyHasMode = false;
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// Skip CommandLine[0].
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for (auto Token = ++CommandLine.begin(); Token != CommandLine.end();
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++Token) {
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StringRef TokenRef(*Token);
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AlreadyHasTarget |=
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(TokenRef == "-target" || TokenRef.startswith("-target="));
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AlreadyHasMode |= (TokenRef == "--driver-mode" ||
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TokenRef.startswith("--driver-mode="));
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}
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auto TargetMode =
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clang::driver::ToolChain::getTargetAndModeFromProgramName(InvokedAs);
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if (!AlreadyHasMode && TargetMode.DriverMode) {
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CommandLine.insert(++CommandLine.begin(), TargetMode.DriverMode);
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}
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if (!AlreadyHasTarget && TargetMode.TargetIsValid) {
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CommandLine.insert(++CommandLine.begin(), {"-target",
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TargetMode.TargetPrefix});
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}
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}
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}
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namespace {
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class SingleFrontendActionFactory : public FrontendActionFactory {
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FrontendAction *Action;
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public:
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SingleFrontendActionFactory(FrontendAction *Action) : Action(Action) {}
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FrontendAction *create() override { return Action; }
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};
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}
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ToolInvocation::ToolInvocation(
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std::vector<std::string> CommandLine, ToolAction *Action,
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FileManager *Files, std::shared_ptr<PCHContainerOperations> PCHContainerOps)
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: CommandLine(std::move(CommandLine)), Action(Action), OwnsAction(false),
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Files(Files), PCHContainerOps(std::move(PCHContainerOps)),
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DiagConsumer(nullptr) {}
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ToolInvocation::ToolInvocation(
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std::vector<std::string> CommandLine, FrontendAction *FAction,
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FileManager *Files, std::shared_ptr<PCHContainerOperations> PCHContainerOps)
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: CommandLine(std::move(CommandLine)),
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Action(new SingleFrontendActionFactory(FAction)), OwnsAction(true),
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Files(Files), PCHContainerOps(std::move(PCHContainerOps)),
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DiagConsumer(nullptr) {}
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ToolInvocation::~ToolInvocation() {
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if (OwnsAction)
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delete Action;
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}
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void ToolInvocation::mapVirtualFile(StringRef FilePath, StringRef Content) {
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SmallString<1024> PathStorage;
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llvm::sys::path::native(FilePath, PathStorage);
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MappedFileContents[PathStorage] = Content;
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}
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bool ToolInvocation::run() {
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std::vector<const char*> Argv;
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for (const std::string &Str : CommandLine)
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Argv.push_back(Str.c_str());
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const char *const BinaryName = Argv[0];
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IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts = new DiagnosticOptions();
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unsigned MissingArgIndex, MissingArgCount;
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std::unique_ptr<llvm::opt::OptTable> Opts = driver::createDriverOptTable();
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llvm::opt::InputArgList ParsedArgs = Opts->ParseArgs(
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ArrayRef<const char *>(Argv).slice(1), MissingArgIndex, MissingArgCount);
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ParseDiagnosticArgs(*DiagOpts, ParsedArgs);
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TextDiagnosticPrinter DiagnosticPrinter(
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llvm::errs(), &*DiagOpts);
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DiagnosticsEngine Diagnostics(
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IntrusiveRefCntPtr<clang::DiagnosticIDs>(new DiagnosticIDs()), &*DiagOpts,
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DiagConsumer ? DiagConsumer : &DiagnosticPrinter, false);
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const std::unique_ptr<clang::driver::Driver> Driver(
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newDriver(&Diagnostics, BinaryName, Files->getVirtualFileSystem()));
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// Since the input might only be virtual, don't check whether it exists.
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Driver->setCheckInputsExist(false);
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const std::unique_ptr<clang::driver::Compilation> Compilation(
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Driver->BuildCompilation(llvm::makeArrayRef(Argv)));
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if (!Compilation)
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return false;
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const llvm::opt::ArgStringList *const CC1Args = getCC1Arguments(
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&Diagnostics, Compilation.get());
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if (!CC1Args) {
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return false;
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}
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std::unique_ptr<clang::CompilerInvocation> Invocation(
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newInvocation(&Diagnostics, *CC1Args));
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// FIXME: remove this when all users have migrated!
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for (const auto &It : MappedFileContents) {
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// Inject the code as the given file name into the preprocessor options.
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std::unique_ptr<llvm::MemoryBuffer> Input =
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llvm::MemoryBuffer::getMemBuffer(It.getValue());
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Invocation->getPreprocessorOpts().addRemappedFile(It.getKey(),
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Input.release());
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}
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return runInvocation(BinaryName, Compilation.get(), std::move(Invocation),
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std::move(PCHContainerOps));
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}
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bool ToolInvocation::runInvocation(
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const char *BinaryName, clang::driver::Compilation *Compilation,
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std::shared_ptr<clang::CompilerInvocation> Invocation,
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std::shared_ptr<PCHContainerOperations> PCHContainerOps) {
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// Show the invocation, with -v.
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if (Invocation->getHeaderSearchOpts().Verbose) {
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llvm::errs() << "clang Invocation:\n";
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Compilation->getJobs().Print(llvm::errs(), "\n", true);
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llvm::errs() << "\n";
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}
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return Action->runInvocation(std::move(Invocation), Files,
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std::move(PCHContainerOps), DiagConsumer);
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}
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bool FrontendActionFactory::runInvocation(
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std::shared_ptr<CompilerInvocation> Invocation, FileManager *Files,
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std::shared_ptr<PCHContainerOperations> PCHContainerOps,
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DiagnosticConsumer *DiagConsumer) {
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// Create a compiler instance to handle the actual work.
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clang::CompilerInstance Compiler(std::move(PCHContainerOps));
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Compiler.setInvocation(std::move(Invocation));
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Compiler.setFileManager(Files);
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// The FrontendAction can have lifetime requirements for Compiler or its
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// members, and we need to ensure it's deleted earlier than Compiler. So we
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// pass it to an std::unique_ptr declared after the Compiler variable.
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std::unique_ptr<FrontendAction> ScopedToolAction(create());
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// Create the compiler's actual diagnostics engine.
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Compiler.createDiagnostics(DiagConsumer, /*ShouldOwnClient=*/false);
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if (!Compiler.hasDiagnostics())
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return false;
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Compiler.createSourceManager(*Files);
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const bool Success = Compiler.ExecuteAction(*ScopedToolAction);
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Files->clearStatCaches();
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return Success;
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}
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ClangTool::ClangTool(const CompilationDatabase &Compilations,
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ArrayRef<std::string> SourcePaths,
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std::shared_ptr<PCHContainerOperations> PCHContainerOps)
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: Compilations(Compilations), SourcePaths(SourcePaths),
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PCHContainerOps(std::move(PCHContainerOps)),
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OverlayFileSystem(new vfs::OverlayFileSystem(vfs::getRealFileSystem())),
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InMemoryFileSystem(new vfs::InMemoryFileSystem),
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Files(new FileManager(FileSystemOptions(), OverlayFileSystem)),
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DiagConsumer(nullptr) {
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OverlayFileSystem->pushOverlay(InMemoryFileSystem);
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appendArgumentsAdjuster(getClangStripOutputAdjuster());
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appendArgumentsAdjuster(getClangSyntaxOnlyAdjuster());
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appendArgumentsAdjuster(getClangStripDependencyFileAdjuster());
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}
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ClangTool::~ClangTool() {}
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void ClangTool::mapVirtualFile(StringRef FilePath, StringRef Content) {
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MappedFileContents.push_back(std::make_pair(FilePath, Content));
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}
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void ClangTool::appendArgumentsAdjuster(ArgumentsAdjuster Adjuster) {
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ArgsAdjuster = combineAdjusters(std::move(ArgsAdjuster), std::move(Adjuster));
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}
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void ClangTool::clearArgumentsAdjusters() {
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ArgsAdjuster = nullptr;
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}
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static void injectResourceDir(CommandLineArguments &Args, const char *Argv0,
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void *MainAddr) {
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// Allow users to override the resource dir.
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for (StringRef Arg : Args)
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if (Arg.startswith("-resource-dir"))
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return;
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// If there's no override in place add our resource dir.
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Args.push_back("-resource-dir=" +
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CompilerInvocation::GetResourcesPath(Argv0, MainAddr));
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}
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int ClangTool::run(ToolAction *Action) {
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// Exists solely for the purpose of lookup of the resource path.
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// This just needs to be some symbol in the binary.
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static int StaticSymbol;
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llvm::SmallString<128> InitialDirectory;
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if (std::error_code EC = llvm::sys::fs::current_path(InitialDirectory))
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llvm::report_fatal_error("Cannot detect current path: " +
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Twine(EC.message()));
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// First insert all absolute paths into the in-memory VFS. These are global
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// for all compile commands.
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if (SeenWorkingDirectories.insert("/").second)
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for (const auto &MappedFile : MappedFileContents)
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if (llvm::sys::path::is_absolute(MappedFile.first))
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InMemoryFileSystem->addFile(
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MappedFile.first, 0,
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llvm::MemoryBuffer::getMemBuffer(MappedFile.second));
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bool ProcessingFailed = false;
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for (const auto &SourcePath : SourcePaths) {
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std::string File(getAbsolutePath(SourcePath));
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// Currently implementations of CompilationDatabase::getCompileCommands can
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// change the state of the file system (e.g. prepare generated headers), so
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// this method needs to run right before we invoke the tool, as the next
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// file may require a different (incompatible) state of the file system.
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//
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// FIXME: Make the compilation database interface more explicit about the
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// requirements to the order of invocation of its members.
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std::vector<CompileCommand> CompileCommandsForFile =
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Compilations.getCompileCommands(File);
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if (CompileCommandsForFile.empty()) {
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// FIXME: There are two use cases here: doing a fuzzy
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// "find . -name '*.cc' |xargs tool" match, where as a user I don't care
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// about the .cc files that were not found, and the use case where I
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// specify all files I want to run over explicitly, where this should
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// be an error. We'll want to add an option for this.
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llvm::errs() << "Skipping " << File << ". Compile command not found.\n";
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continue;
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}
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for (CompileCommand &CompileCommand : CompileCommandsForFile) {
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// FIXME: chdir is thread hostile; on the other hand, creating the same
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// behavior as chdir is complex: chdir resolves the path once, thus
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// guaranteeing that all subsequent relative path operations work
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// on the same path the original chdir resulted in. This makes a
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// difference for example on network filesystems, where symlinks might be
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// switched during runtime of the tool. Fixing this depends on having a
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// file system abstraction that allows openat() style interactions.
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if (OverlayFileSystem->setCurrentWorkingDirectory(
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CompileCommand.Directory))
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llvm::report_fatal_error("Cannot chdir into \"" +
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Twine(CompileCommand.Directory) + "\n!");
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// Now fill the in-memory VFS with the relative file mappings so it will
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// have the correct relative paths. We never remove mappings but that
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// should be fine.
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if (SeenWorkingDirectories.insert(CompileCommand.Directory).second)
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for (const auto &MappedFile : MappedFileContents)
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if (!llvm::sys::path::is_absolute(MappedFile.first))
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InMemoryFileSystem->addFile(
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MappedFile.first, 0,
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llvm::MemoryBuffer::getMemBuffer(MappedFile.second));
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std::vector<std::string> CommandLine = CompileCommand.CommandLine;
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if (ArgsAdjuster)
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CommandLine = ArgsAdjuster(CommandLine, CompileCommand.Filename);
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assert(!CommandLine.empty());
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// Add the resource dir based on the binary of this tool. argv[0] in the
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// compilation database may refer to a different compiler and we want to
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// pick up the very same standard library that compiler is using. The
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// builtin headers in the resource dir need to match the exact clang
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// version the tool is using.
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// FIXME: On linux, GetMainExecutable is independent of the value of the
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// first argument, thus allowing ClangTool and runToolOnCode to just
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// pass in made-up names here. Make sure this works on other platforms.
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injectResourceDir(CommandLine, "clang_tool", &StaticSymbol);
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// FIXME: We need a callback mechanism for the tool writer to output a
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// customized message for each file.
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DEBUG({ llvm::dbgs() << "Processing: " << File << ".\n"; });
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ToolInvocation Invocation(std::move(CommandLine), Action, Files.get(),
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PCHContainerOps);
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Invocation.setDiagnosticConsumer(DiagConsumer);
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if (!Invocation.run()) {
|
|
// FIXME: Diagnostics should be used instead.
|
|
llvm::errs() << "Error while processing " << File << ".\n";
|
|
ProcessingFailed = true;
|
|
}
|
|
// Return to the initial directory to correctly resolve next file by
|
|
// relative path.
|
|
if (OverlayFileSystem->setCurrentWorkingDirectory(InitialDirectory.c_str()))
|
|
llvm::report_fatal_error("Cannot chdir into \"" +
|
|
Twine(InitialDirectory) + "\n!");
|
|
}
|
|
}
|
|
return ProcessingFailed ? 1 : 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;
|
|
}
|
|
};
|
|
}
|
|
|
|
int ClangTool::buildASTs(std::vector<std::unique_ptr<ASTUnit>> &ASTs) {
|
|
ASTBuilderAction Action(ASTs);
|
|
return run(&Action);
|
|
}
|
|
|
|
std::unique_ptr<ASTUnit>
|
|
buildASTFromCode(const Twine &Code, const Twine &FileName,
|
|
std::shared_ptr<PCHContainerOperations> PCHContainerOps) {
|
|
return buildASTFromCodeWithArgs(Code, std::vector<std::string>(), FileName,
|
|
"clang-tool", std::move(PCHContainerOps));
|
|
}
|
|
|
|
std::unique_ptr<ASTUnit> buildASTFromCodeWithArgs(
|
|
const Twine &Code, const std::vector<std::string> &Args,
|
|
const Twine &FileName, const Twine &ToolName,
|
|
std::shared_ptr<PCHContainerOperations> PCHContainerOps,
|
|
ArgumentsAdjuster Adjuster) {
|
|
SmallString<16> FileNameStorage;
|
|
StringRef FileNameRef = FileName.toNullTerminatedStringRef(FileNameStorage);
|
|
|
|
std::vector<std::unique_ptr<ASTUnit>> ASTs;
|
|
ASTBuilderAction Action(ASTs);
|
|
llvm::IntrusiveRefCntPtr<vfs::OverlayFileSystem> OverlayFileSystem(
|
|
new vfs::OverlayFileSystem(vfs::getRealFileSystem()));
|
|
llvm::IntrusiveRefCntPtr<vfs::InMemoryFileSystem> InMemoryFileSystem(
|
|
new vfs::InMemoryFileSystem);
|
|
OverlayFileSystem->pushOverlay(InMemoryFileSystem);
|
|
llvm::IntrusiveRefCntPtr<FileManager> Files(
|
|
new FileManager(FileSystemOptions(), OverlayFileSystem));
|
|
|
|
ToolInvocation Invocation(
|
|
getSyntaxOnlyToolArgs(ToolName, Adjuster(Args, FileNameRef), FileNameRef),
|
|
&Action, Files.get(), std::move(PCHContainerOps));
|
|
|
|
SmallString<1024> CodeStorage;
|
|
InMemoryFileSystem->addFile(FileNameRef, 0,
|
|
llvm::MemoryBuffer::getMemBuffer(
|
|
Code.toNullTerminatedStringRef(CodeStorage)));
|
|
if (!Invocation.run())
|
|
return nullptr;
|
|
|
|
assert(ASTs.size() == 1);
|
|
return std::move(ASTs[0]);
|
|
}
|
|
|
|
} // end namespace tooling
|
|
} // end namespace clang
|