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llvm-project/clang-tools-extra/clang-tidy/ClangTidy.cpp

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//===--- tools/extra/clang-tidy/ClangTidy.cpp - Clang tidy tool -----------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
///
/// \file This file implements a clang-tidy tool.
///
/// This tool uses the Clang Tooling infrastructure, see
/// http://clang.llvm.org/docs/HowToSetupToolingForLLVM.html
/// for details on setting it up with LLVM source tree.
///
//===----------------------------------------------------------------------===//
#include "ClangTidy.h"
#include "ClangTidyDiagnosticConsumer.h"
#include "ClangTidyModuleRegistry.h"
#include "clang/AST/ASTConsumer.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/Decl.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include "clang/Frontend/ASTConsumers.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Frontend/FrontendActions.h"
#include "clang/Frontend/FrontendDiagnostic.h"
#include "clang/Frontend/MultiplexConsumer.h"
#include "clang/Frontend/TextDiagnosticPrinter.h"
#include "clang/Lex/PPCallbacks.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Rewrite/Frontend/FixItRewriter.h"
#include "clang/Rewrite/Frontend/FrontendActions.h"
#include "clang/StaticAnalyzer/Frontend/AnalysisConsumer.h"
#include "clang/Tooling/Refactoring.h"
#include "clang/Tooling/ReplacementsYaml.h"
#include "clang/Tooling/Tooling.h"
#include "llvm/Support/Process.h"
#include "llvm/Support/Signals.h"
#include <algorithm>
#include <utility>
using namespace clang::ast_matchers;
using namespace clang::driver;
using namespace clang::tooling;
using namespace llvm;
template class llvm::Registry<clang::tidy::ClangTidyModule>;
namespace clang {
namespace tidy {
namespace {
static const char *AnalyzerCheckNamePrefix = "clang-analyzer-";
static const StringRef StaticAnalyzerChecks[] = {
#define GET_CHECKERS
#define CHECKER(FULLNAME, CLASS, DESCFILE, HELPTEXT, GROUPINDEX, HIDDEN) \
FULLNAME,
#include "clang/StaticAnalyzer/Checkers/Checkers.inc"
#undef CHECKER
#undef GET_CHECKERS
};
class AnalyzerDiagnosticConsumer : public ento::PathDiagnosticConsumer {
public:
AnalyzerDiagnosticConsumer(ClangTidyContext &Context) : Context(Context) {}
void FlushDiagnosticsImpl(std::vector<const ento::PathDiagnostic *> &Diags,
FilesMade *filesMade) override {
for (const ento::PathDiagnostic *PD : Diags) {
SmallString<64> CheckName(AnalyzerCheckNamePrefix);
CheckName += PD->getCheckName();
Context.diag(CheckName, PD->getLocation().asLocation(),
PD->getShortDescription())
<< PD->path.back()->getRanges();
for (const auto &DiagPiece :
PD->path.flatten(/*ShouldFlattenMacros=*/true)) {
Context.diag(CheckName, DiagPiece->getLocation().asLocation(),
DiagPiece->getString(), DiagnosticIDs::Note)
<< DiagPiece->getRanges();
}
}
}
StringRef getName() const override { return "ClangTidyDiags"; }
bool supportsLogicalOpControlFlow() const override { return true; }
bool supportsCrossFileDiagnostics() const override { return true; }
private:
ClangTidyContext &Context;
};
class ErrorReporter {
public:
ErrorReporter(bool ApplyFixes)
: Files(FileSystemOptions()), DiagOpts(new DiagnosticOptions()),
DiagPrinter(new TextDiagnosticPrinter(llvm::outs(), &*DiagOpts)),
Diags(IntrusiveRefCntPtr<DiagnosticIDs>(new DiagnosticIDs), &*DiagOpts,
DiagPrinter),
SourceMgr(Diags, Files), Rewrite(SourceMgr, LangOpts),
ApplyFixes(ApplyFixes), TotalFixes(0), AppliedFixes(0),
WarningsAsErrors(0) {
DiagOpts->ShowColors = llvm::sys::Process::StandardOutHasColors();
DiagPrinter->BeginSourceFile(LangOpts);
}
SourceManager &getSourceManager() { return SourceMgr; }
void reportDiagnostic(const ClangTidyError &Error) {
const ClangTidyMessage &Message = Error.Message;
SourceLocation Loc = getLocation(Message.FilePath, Message.FileOffset);
// Contains a pair for each attempted fix: location and whether the fix was
// applied successfully.
SmallVector<std::pair<SourceLocation, bool>, 4> FixLocations;
{
auto Level = static_cast<DiagnosticsEngine::Level>(Error.DiagLevel);
std::string Name = Error.CheckName;
if (Error.IsWarningAsError) {
Name += ",-warnings-as-errors";
Level = DiagnosticsEngine::Error;
WarningsAsErrors++;
}
auto Diag = Diags.Report(Loc, Diags.getCustomDiagID(Level, "%0 [%1]"))
<< Message.Message << Name;
for (const tooling::Replacement &Fix : Error.Fix) {
// Retrieve the source range for applicable fixes. Macro definitions
// on the command line have locations in a virtual buffer and don't
// have valid file paths and are therefore not applicable.
SourceRange Range;
SourceLocation FixLoc;
if (Fix.isApplicable()) {
SmallString<128> FixAbsoluteFilePath = Fix.getFilePath();
Files.makeAbsolutePath(FixAbsoluteFilePath);
FixLoc = getLocation(FixAbsoluteFilePath, Fix.getOffset());
SourceLocation FixEndLoc = FixLoc.getLocWithOffset(Fix.getLength());
Range = SourceRange(FixLoc, FixEndLoc);
Diag << FixItHint::CreateReplacement(Range, Fix.getReplacementText());
}
++TotalFixes;
if (ApplyFixes) {
bool Success = Fix.isApplicable() && Fix.apply(Rewrite);
if (Success)
++AppliedFixes;
FixLocations.push_back(std::make_pair(FixLoc, Success));
}
}
}
for (auto Fix : FixLocations) {
Diags.Report(Fix.first, Fix.second ? diag::note_fixit_applied
: diag::note_fixit_failed);
}
for (const ClangTidyMessage &Note : Error.Notes)
reportNote(Note);
}
void Finish() {
// FIXME: Run clang-format on changes.
if (ApplyFixes && TotalFixes > 0) {
llvm::errs() << "clang-tidy applied " << AppliedFixes << " of "
<< TotalFixes << " suggested fixes.\n";
Rewrite.overwriteChangedFiles();
}
}
unsigned getWarningsAsErrorsCount() const { return WarningsAsErrors; }
private:
SourceLocation getLocation(StringRef FilePath, unsigned Offset) {
if (FilePath.empty())
return SourceLocation();
const FileEntry *File = SourceMgr.getFileManager().getFile(FilePath);
FileID ID = SourceMgr.createFileID(File, SourceLocation(), SrcMgr::C_User);
return SourceMgr.getLocForStartOfFile(ID).getLocWithOffset(Offset);
}
void reportNote(const ClangTidyMessage &Message) {
SourceLocation Loc = getLocation(Message.FilePath, Message.FileOffset);
DiagnosticBuilder Diag =
Diags.Report(Loc, Diags.getCustomDiagID(DiagnosticsEngine::Note, "%0"))
<< Message.Message;
}
FileManager Files;
LangOptions LangOpts; // FIXME: use langopts from each original file
IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts;
DiagnosticConsumer *DiagPrinter;
DiagnosticsEngine Diags;
SourceManager SourceMgr;
Rewriter Rewrite;
bool ApplyFixes;
unsigned TotalFixes;
unsigned AppliedFixes;
unsigned WarningsAsErrors;
};
class ClangTidyASTConsumer : public MultiplexConsumer {
public:
ClangTidyASTConsumer(std::vector<std::unique_ptr<ASTConsumer>> Consumers,
std::unique_ptr<ast_matchers::MatchFinder> Finder,
std::vector<std::unique_ptr<ClangTidyCheck>> Checks)
: MultiplexConsumer(std::move(Consumers)), Finder(std::move(Finder)),
Checks(std::move(Checks)) {}
private:
std::unique_ptr<ast_matchers::MatchFinder> Finder;
std::vector<std::unique_ptr<ClangTidyCheck>> Checks;
};
} // namespace
ClangTidyASTConsumerFactory::ClangTidyASTConsumerFactory(
ClangTidyContext &Context)
: Context(Context), CheckFactories(new ClangTidyCheckFactories) {
for (ClangTidyModuleRegistry::iterator I = ClangTidyModuleRegistry::begin(),
E = ClangTidyModuleRegistry::end();
I != E; ++I) {
std::unique_ptr<ClangTidyModule> Module(I->instantiate());
Module->addCheckFactories(*CheckFactories);
}
}
static void setStaticAnalyzerCheckerOpts(const ClangTidyOptions &Opts,
AnalyzerOptionsRef AnalyzerOptions) {
StringRef AnalyzerPrefix(AnalyzerCheckNamePrefix);
for (const auto &Opt : Opts.CheckOptions) {
StringRef OptName(Opt.first);
if (!OptName.startswith(AnalyzerPrefix))
continue;
AnalyzerOptions->Config[OptName.substr(AnalyzerPrefix.size())] = Opt.second;
}
}
std::unique_ptr<clang::ASTConsumer>
ClangTidyASTConsumerFactory::CreateASTConsumer(
clang::CompilerInstance &Compiler, StringRef File) {
// FIXME: Move this to a separate method, so that CreateASTConsumer doesn't
// modify Compiler.
Context.setSourceManager(&Compiler.getSourceManager());
Context.setCurrentFile(File);
Context.setASTContext(&Compiler.getASTContext());
auto WorkingDir = Compiler.getSourceManager()
.getFileManager()
.getVirtualFileSystem()
->getCurrentWorkingDirectory();
if (WorkingDir)
Context.setCurrentBuildDirectory(WorkingDir.get());
std::vector<std::unique_ptr<ClangTidyCheck>> Checks;
CheckFactories->createChecks(&Context, Checks);
ast_matchers::MatchFinder::MatchFinderOptions FinderOptions;
if (auto *P = Context.getCheckProfileData())
FinderOptions.CheckProfiling.emplace(P->Records);
std::unique_ptr<ast_matchers::MatchFinder> Finder(
new ast_matchers::MatchFinder(std::move(FinderOptions)));
for (auto &Check : Checks) {
Check->registerMatchers(&*Finder);
Check->registerPPCallbacks(Compiler);
}
std::vector<std::unique_ptr<ASTConsumer>> Consumers;
if (!Checks.empty())
Consumers.push_back(Finder->newASTConsumer());
AnalyzerOptionsRef AnalyzerOptions = Compiler.getAnalyzerOpts();
// FIXME: Remove this option once clang's cfg-temporary-dtors option defaults
// to true.
AnalyzerOptions->Config["cfg-temporary-dtors"] =
Context.getOptions().AnalyzeTemporaryDtors ? "true" : "false";
GlobList &Filter = Context.getChecksFilter();
AnalyzerOptions->CheckersControlList = getCheckersControlList(Filter);
if (!AnalyzerOptions->CheckersControlList.empty()) {
setStaticAnalyzerCheckerOpts(Context.getOptions(), AnalyzerOptions);
AnalyzerOptions->AnalysisStoreOpt = RegionStoreModel;
AnalyzerOptions->AnalysisDiagOpt = PD_NONE;
AnalyzerOptions->AnalyzeNestedBlocks = true;
AnalyzerOptions->eagerlyAssumeBinOpBifurcation = true;
std::unique_ptr<ento::AnalysisASTConsumer> AnalysisConsumer =
ento::CreateAnalysisConsumer(Compiler);
AnalysisConsumer->AddDiagnosticConsumer(
new AnalyzerDiagnosticConsumer(Context));
Consumers.push_back(std::move(AnalysisConsumer));
}
return llvm::make_unique<ClangTidyASTConsumer>(
std::move(Consumers), std::move(Finder), std::move(Checks));
}
std::vector<std::string> ClangTidyASTConsumerFactory::getCheckNames() {
std::vector<std::string> CheckNames;
GlobList &Filter = Context.getChecksFilter();
for (const auto &CheckFactory : *CheckFactories) {
if (Filter.contains(CheckFactory.first))
CheckNames.push_back(CheckFactory.first);
}
for (const auto &AnalyzerCheck : getCheckersControlList(Filter))
CheckNames.push_back(AnalyzerCheckNamePrefix + AnalyzerCheck.first);
std::sort(CheckNames.begin(), CheckNames.end());
return CheckNames;
}
ClangTidyOptions::OptionMap ClangTidyASTConsumerFactory::getCheckOptions() {
ClangTidyOptions::OptionMap Options;
std::vector<std::unique_ptr<ClangTidyCheck>> Checks;
CheckFactories->createChecks(&Context, Checks);
for (const auto &Check : Checks)
Check->storeOptions(Options);
return Options;
}
ClangTidyASTConsumerFactory::CheckersList
ClangTidyASTConsumerFactory::getCheckersControlList(GlobList &Filter) {
CheckersList List;
bool AnalyzerChecksEnabled = false;
for (StringRef CheckName : StaticAnalyzerChecks) {
std::string Checker((AnalyzerCheckNamePrefix + CheckName).str());
AnalyzerChecksEnabled =
AnalyzerChecksEnabled ||
(!CheckName.startswith("debug") && Filter.contains(Checker));
}
if (AnalyzerChecksEnabled) {
// Run our regex against all possible static analyzer checkers. Note that
// debug checkers print values / run programs to visualize the CFG and are
// thus not applicable to clang-tidy in general.
//
// Always add all core checkers if any other static analyzer checks are
// enabled. This is currently necessary, as other path sensitive checks
// rely on the core checkers.
for (StringRef CheckName : StaticAnalyzerChecks) {
std::string Checker((AnalyzerCheckNamePrefix + CheckName).str());
if (CheckName.startswith("core") ||
(!CheckName.startswith("debug") && Filter.contains(Checker)))
List.push_back(std::make_pair(CheckName, true));
}
}
return List;
}
DiagnosticBuilder ClangTidyCheck::diag(SourceLocation Loc, StringRef Message,
DiagnosticIDs::Level Level) {
return Context->diag(CheckName, Loc, Message, Level);
}
void ClangTidyCheck::run(const ast_matchers::MatchFinder::MatchResult &Result) {
Context->setSourceManager(Result.SourceManager);
check(Result);
}
OptionsView::OptionsView(StringRef CheckName,
const ClangTidyOptions::OptionMap &CheckOptions)
: NamePrefix(CheckName.str() + "."), CheckOptions(CheckOptions) {}
std::string OptionsView::get(StringRef LocalName, StringRef Default) const {
const auto &Iter = CheckOptions.find(NamePrefix + LocalName.str());
if (Iter != CheckOptions.end())
return Iter->second;
return Default;
}
std::string OptionsView::getLocalOrGlobal(StringRef LocalName,
StringRef Default) const {
auto Iter = CheckOptions.find(NamePrefix + LocalName.str());
if (Iter != CheckOptions.end())
return Iter->second;
// Fallback to global setting, if present.
Iter = CheckOptions.find(LocalName.str());
if (Iter != CheckOptions.end())
return Iter->second;
return Default;
}
void OptionsView::store(ClangTidyOptions::OptionMap &Options,
StringRef LocalName, StringRef Value) const {
Options[NamePrefix + LocalName.str()] = Value;
}
void OptionsView::store(ClangTidyOptions::OptionMap &Options,
StringRef LocalName, int64_t Value) const {
store(Options, LocalName, llvm::itostr(Value));
}
std::vector<std::string> getCheckNames(const ClangTidyOptions &Options) {
clang::tidy::ClangTidyContext Context(
llvm::make_unique<DefaultOptionsProvider>(ClangTidyGlobalOptions(),
Options));
ClangTidyASTConsumerFactory Factory(Context);
return Factory.getCheckNames();
}
ClangTidyOptions::OptionMap getCheckOptions(const ClangTidyOptions &Options) {
clang::tidy::ClangTidyContext Context(
llvm::make_unique<DefaultOptionsProvider>(ClangTidyGlobalOptions(),
Options));
ClangTidyASTConsumerFactory Factory(Context);
return Factory.getCheckOptions();
}
ClangTidyStats
runClangTidy(std::unique_ptr<ClangTidyOptionsProvider> OptionsProvider,
const tooling::CompilationDatabase &Compilations,
ArrayRef<std::string> InputFiles,
std::vector<ClangTidyError> *Errors, ProfileData *Profile) {
ClangTool Tool(Compilations, InputFiles);
clang::tidy::ClangTidyContext Context(std::move(OptionsProvider));
// Add extra arguments passed by the clang-tidy command-line.
ArgumentsAdjuster PerFileExtraArgumentsInserter =
[&Context](const CommandLineArguments &Args, StringRef Filename) {
ClangTidyOptions Opts = Context.getOptionsForFile(Filename);
CommandLineArguments AdjustedArgs;
if (Opts.ExtraArgsBefore)
AdjustedArgs = *Opts.ExtraArgsBefore;
AdjustedArgs.insert(AdjustedArgs.begin(), Args.begin(), Args.end());
if (Opts.ExtraArgs)
AdjustedArgs.insert(AdjustedArgs.end(), Opts.ExtraArgs->begin(),
Opts.ExtraArgs->end());
return AdjustedArgs;
};
// Remove plugins arguments.
ArgumentsAdjuster PluginArgumentsRemover =
[&Context](const CommandLineArguments &Args, StringRef Filename) {
CommandLineArguments AdjustedArgs;
for (size_t I = 0, E = Args.size(); I < E; ++I) {
if (I + 4 < Args.size() && Args[I] == "-Xclang" &&
(Args[I + 1] == "-load" || Args[I + 1] == "-add-plugin" ||
StringRef(Args[I + 1]).startswith("-plugin-arg-")) &&
Args[I + 2] == "-Xclang") {
I += 3;
} else
AdjustedArgs.push_back(Args[I]);
}
return AdjustedArgs;
};
Tool.appendArgumentsAdjuster(PerFileExtraArgumentsInserter);
Tool.appendArgumentsAdjuster(PluginArgumentsRemover);
if (Profile)
Context.setCheckProfileData(Profile);
ClangTidyDiagnosticConsumer DiagConsumer(Context);
Tool.setDiagnosticConsumer(&DiagConsumer);
class ActionFactory : public FrontendActionFactory {
public:
ActionFactory(ClangTidyContext &Context) : ConsumerFactory(Context) {}
FrontendAction *create() override { return new Action(&ConsumerFactory); }
private:
class Action : public ASTFrontendAction {
public:
Action(ClangTidyASTConsumerFactory *Factory) : Factory(Factory) {}
std::unique_ptr<ASTConsumer> CreateASTConsumer(CompilerInstance &Compiler,
StringRef File) override {
return Factory->CreateASTConsumer(Compiler, File);
}
private:
ClangTidyASTConsumerFactory *Factory;
};
ClangTidyASTConsumerFactory ConsumerFactory;
};
ActionFactory Factory(Context);
Tool.run(&Factory);
*Errors = Context.getErrors();
return Context.getStats();
}
void handleErrors(const std::vector<ClangTidyError> &Errors, bool Fix,
unsigned &WarningsAsErrorsCount) {
ErrorReporter Reporter(Fix);
vfs::FileSystem &FileSystem =
*Reporter.getSourceManager().getFileManager().getVirtualFileSystem();
auto InitialWorkingDir = FileSystem.getCurrentWorkingDirectory();
if (!InitialWorkingDir)
llvm::report_fatal_error("Cannot get current working path.");
for (const ClangTidyError &Error : Errors) {
if (!Error.BuildDirectory.empty()) {
// By default, the working directory of file system is the current
// clang-tidy running directory.
//
// Change the directory to the one used during the analysis.
FileSystem.setCurrentWorkingDirectory(Error.BuildDirectory);
}
Reporter.reportDiagnostic(Error);
// Return to the initial directory to correctly resolve next Error.
FileSystem.setCurrentWorkingDirectory(InitialWorkingDir.get());
}
Reporter.Finish();
WarningsAsErrorsCount += Reporter.getWarningsAsErrorsCount();
}
void exportReplacements(const std::vector<ClangTidyError> &Errors,
raw_ostream &OS) {
tooling::TranslationUnitReplacements TUR;
for (const ClangTidyError &Error : Errors)
TUR.Replacements.insert(TUR.Replacements.end(), Error.Fix.begin(),
Error.Fix.end());
yaml::Output YAML(OS);
YAML << TUR;
}
} // namespace tidy
} // namespace clang
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