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DependencyScanningWorker.cpp
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DependencyScanningWorker.cpp
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//===- DependencyScanningWorker.cpp - clang-scan-deps worker --------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "clang/Tooling/DependencyScanning/DependencyScanningWorker.h"
#include "clang/CodeGen/ObjectFilePCHContainerOperations.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Frontend/CompilerInvocation.h"
#include "clang/Frontend/FrontendActions.h"
#include "clang/Frontend/TextDiagnosticPrinter.h"
#include "clang/Frontend/Utils.h"
#include "clang/Lex/PreprocessorOptions.h"
#include "clang/Tooling/DependencyScanning/DependencyScanningService.h"
#include "clang/Tooling/DependencyScanning/ModuleDepCollector.h"
#include "clang/Tooling/Tooling.h"
using namespace clang;
using namespace tooling;
using namespace dependencies;
namespace {
/// Forwards the gatherered dependencies to the consumer.
class DependencyConsumerForwarder : public DependencyFileGenerator {
public:
DependencyConsumerForwarder(std::unique_ptr<DependencyOutputOptions> Opts,
DependencyConsumer &C)
: DependencyFileGenerator(*Opts), Opts(std::move(Opts)), C(C) {}
void finishedMainFile(DiagnosticsEngine &Diags) override {
C.handleDependencyOutputOpts(*Opts);
llvm::SmallString<256> CanonPath;
for (const auto &File : getDependencies()) {
CanonPath = File;
llvm::sys::path::remove_dots(CanonPath, /*remove_dot_dot=*/true);
C.handleFileDependency(CanonPath);
}
}
private:
std::unique_ptr<DependencyOutputOptions> Opts;
DependencyConsumer &C;
};
using PrebuiltModuleFilesT = decltype(HeaderSearchOptions::PrebuiltModuleFiles);
/// A listener that collects the imported modules and optionally the input
/// files.
class PrebuiltModuleListener : public ASTReaderListener {
public:
PrebuiltModuleListener(PrebuiltModuleFilesT &PrebuiltModuleFiles,
llvm::StringSet<> &InputFiles, bool VisitInputFiles,
llvm::SmallVector<std::string> &NewModuleFiles)
: PrebuiltModuleFiles(PrebuiltModuleFiles), InputFiles(InputFiles),
VisitInputFiles(VisitInputFiles), NewModuleFiles(NewModuleFiles) {}
bool needsImportVisitation() const override { return true; }
bool needsInputFileVisitation() override { return VisitInputFiles; }
bool needsSystemInputFileVisitation() override { return VisitInputFiles; }
void visitImport(StringRef ModuleName, StringRef Filename) override {
if (PrebuiltModuleFiles.insert({ModuleName.str(), Filename.str()}).second)
NewModuleFiles.push_back(Filename.str());
}
bool visitInputFile(StringRef Filename, bool isSystem, bool isOverridden,
bool isExplicitModule) override {
InputFiles.insert(Filename);
return true;
}
private:
PrebuiltModuleFilesT &PrebuiltModuleFiles;
llvm::StringSet<> &InputFiles;
bool VisitInputFiles;
llvm::SmallVector<std::string> &NewModuleFiles;
};
/// Visit the given prebuilt module and collect all of the modules it
/// transitively imports and contributing input files.
static void visitPrebuiltModule(StringRef PrebuiltModuleFilename,
CompilerInstance &CI,
PrebuiltModuleFilesT &ModuleFiles,
llvm::StringSet<> &InputFiles,
bool VisitInputFiles) {
// List of module files to be processed.
llvm::SmallVector<std::string> Worklist{PrebuiltModuleFilename.str()};
PrebuiltModuleListener Listener(ModuleFiles, InputFiles, VisitInputFiles,
Worklist);
while (!Worklist.empty())
ASTReader::readASTFileControlBlock(
Worklist.pop_back_val(), CI.getFileManager(),
CI.getPCHContainerReader(),
/*FindModuleFileExtensions=*/false, Listener,
/*ValidateDiagnosticOptions=*/false);
}
/// Transform arbitrary file name into an object-like file name.
static std::string makeObjFileName(StringRef FileName) {
SmallString<128> ObjFileName(FileName);
llvm::sys::path::replace_extension(ObjFileName, "o");
return std::string(ObjFileName.str());
}
/// Deduce the dependency target based on the output file and input files.
static std::string
deduceDepTarget(const std::string &OutputFile,
const SmallVectorImpl<FrontendInputFile> &InputFiles) {
if (OutputFile != "-")
return OutputFile;
if (InputFiles.empty() || !InputFiles.front().isFile())
return "clang-scan-deps\\ dependency";
return makeObjFileName(InputFiles.front().getFile());
}
/// Sanitize diagnostic options for dependency scan.
static void sanitizeDiagOpts(DiagnosticOptions &DiagOpts) {
// Don't print 'X warnings and Y errors generated'.
DiagOpts.ShowCarets = false;
// Don't write out diagnostic file.
DiagOpts.DiagnosticSerializationFile.clear();
// Don't treat warnings as errors.
DiagOpts.Warnings.push_back("no-error");
}
/// A clang tool that runs the preprocessor in a mode that's optimized for
/// dependency scanning for the given compiler invocation.
class DependencyScanningAction : public tooling::ToolAction {
public:
DependencyScanningAction(
StringRef WorkingDirectory, DependencyConsumer &Consumer,
llvm::IntrusiveRefCntPtr<DependencyScanningWorkerFilesystem> DepFS,
ExcludedPreprocessorDirectiveSkipMapping *PPSkipMappings,
ScanningOutputFormat Format, bool OptimizeArgs,
llvm::Optional<StringRef> ModuleName = None)
: WorkingDirectory(WorkingDirectory), Consumer(Consumer),
DepFS(std::move(DepFS)), PPSkipMappings(PPSkipMappings), Format(Format),
OptimizeArgs(OptimizeArgs), ModuleName(ModuleName) {}
bool runInvocation(std::shared_ptr<CompilerInvocation> Invocation,
FileManager *FileMgr,
std::shared_ptr<PCHContainerOperations> PCHContainerOps,
DiagnosticConsumer *DiagConsumer) override {
// Make a deep copy of the original Clang invocation.
CompilerInvocation OriginalInvocation(*Invocation);
// Create a compiler instance to handle the actual work.
CompilerInstance ScanInstance(std::move(PCHContainerOps));
ScanInstance.setInvocation(std::move(Invocation));
// Create the compiler's actual diagnostics engine.
sanitizeDiagOpts(ScanInstance.getDiagnosticOpts());
ScanInstance.createDiagnostics(DiagConsumer, /*ShouldOwnClient=*/false);
if (!ScanInstance.hasDiagnostics())
return false;
ScanInstance.getPreprocessorOpts().AllowPCHWithDifferentModulesCachePath =
true;
ScanInstance.getFrontendOpts().GenerateGlobalModuleIndex = false;
ScanInstance.getFrontendOpts().UseGlobalModuleIndex = false;
FileMgr->getFileSystemOpts().WorkingDir = std::string(WorkingDirectory);
ScanInstance.setFileManager(FileMgr);
ScanInstance.createSourceManager(*FileMgr);
llvm::StringSet<> PrebuiltModulesInputFiles;
// Store the list of prebuilt module files into header search options. This
// will prevent the implicit build to create duplicate modules and will
// force reuse of the existing prebuilt module files instead.
if (!ScanInstance.getPreprocessorOpts().ImplicitPCHInclude.empty())
visitPrebuiltModule(
ScanInstance.getPreprocessorOpts().ImplicitPCHInclude, ScanInstance,
ScanInstance.getHeaderSearchOpts().PrebuiltModuleFiles,
PrebuiltModulesInputFiles, /*VisitInputFiles=*/DepFS != nullptr);
// Use the dependency scanning optimized file system if requested to do so.
if (DepFS) {
DepFS->enableMinimizationOfAllFiles();
// Don't minimize any files that contributed to prebuilt modules. The
// implicit build validates the modules by comparing the reported sizes of
// their inputs to the current state of the filesystem. Minimization would
// throw this mechanism off.
for (const auto &File : PrebuiltModulesInputFiles)
DepFS->disableMinimization(File.getKey());
// Don't minimize any files that were explicitly passed in the build
// settings and that might be opened.
for (const auto &E : ScanInstance.getHeaderSearchOpts().UserEntries)
DepFS->disableMinimization(E.Path);
for (const auto &F : ScanInstance.getHeaderSearchOpts().VFSOverlayFiles)
DepFS->disableMinimization(F);
// Support for virtual file system overlays on top of the caching
// filesystem.
FileMgr->setVirtualFileSystem(createVFSFromCompilerInvocation(
ScanInstance.getInvocation(), ScanInstance.getDiagnostics(), DepFS));
// Pass the skip mappings which should speed up excluded conditional block
// skipping in the preprocessor.
if (PPSkipMappings)
ScanInstance.getPreprocessorOpts()
.ExcludedConditionalDirectiveSkipMappings = PPSkipMappings;
}
// Create the dependency collector that will collect the produced
// dependencies.
//
// This also moves the existing dependency output options from the
// invocation to the collector. The options in the invocation are reset,
// which ensures that the compiler won't create new dependency collectors,
// and thus won't write out the extra '.d' files to disk.
auto Opts = std::make_unique<DependencyOutputOptions>();
std::swap(*Opts, ScanInstance.getInvocation().getDependencyOutputOpts());
// We need at least one -MT equivalent for the generator of make dependency
// files to work.
if (Opts->Targets.empty())
Opts->Targets = {
deduceDepTarget(ScanInstance.getFrontendOpts().OutputFile,
ScanInstance.getFrontendOpts().Inputs)};
Opts->IncludeSystemHeaders = true;
switch (Format) {
case ScanningOutputFormat::Make:
ScanInstance.addDependencyCollector(
std::make_shared<DependencyConsumerForwarder>(std::move(Opts),
Consumer));
break;
case ScanningOutputFormat::Full:
ScanInstance.addDependencyCollector(std::make_shared<ModuleDepCollector>(
std::move(Opts), ScanInstance, Consumer,
std::move(OriginalInvocation), OptimizeArgs));
break;
}
// Consider different header search and diagnostic options to create
// different modules. This avoids the unsound aliasing of module PCMs.
//
// TODO: Implement diagnostic bucketing to reduce the impact of strict
// context hashing.
ScanInstance.getHeaderSearchOpts().ModulesStrictContextHash = true;
std::unique_ptr<FrontendAction> Action;
if (ModuleName.hasValue())
Action = std::make_unique<GetDependenciesByModuleNameAction>(*ModuleName);
else
Action = std::make_unique<ReadPCHAndPreprocessAction>();
const bool Result = ScanInstance.ExecuteAction(*Action);
if (!DepFS)
FileMgr->clearStatCache();
return Result;
}
private:
StringRef WorkingDirectory;
DependencyConsumer &Consumer;
llvm::IntrusiveRefCntPtr<DependencyScanningWorkerFilesystem> DepFS;
ExcludedPreprocessorDirectiveSkipMapping *PPSkipMappings;
ScanningOutputFormat Format;
bool OptimizeArgs;
llvm::Optional<StringRef> ModuleName;
};
} // end anonymous namespace
DependencyScanningWorker::DependencyScanningWorker(
DependencyScanningService &Service)
: Format(Service.getFormat()), OptimizeArgs(Service.canOptimizeArgs()) {
PCHContainerOps = std::make_shared<PCHContainerOperations>();
PCHContainerOps->registerReader(
std::make_unique<ObjectFilePCHContainerReader>());
// We don't need to write object files, but the current PCH implementation
// requires the writer to be registered as well.
PCHContainerOps->registerWriter(
std::make_unique<ObjectFilePCHContainerWriter>());
auto OverlayFS = llvm::makeIntrusiveRefCnt<llvm::vfs::OverlayFileSystem>(
llvm::vfs::createPhysicalFileSystem());
InMemoryFS = llvm::makeIntrusiveRefCnt<llvm::vfs::InMemoryFileSystem>();
OverlayFS->pushOverlay(InMemoryFS);
RealFS = OverlayFS;
if (Service.canSkipExcludedPPRanges())
PPSkipMappings =
std::make_unique<ExcludedPreprocessorDirectiveSkipMapping>();
if (Service.getMode() == ScanningMode::MinimizedSourcePreprocessing)
DepFS = new DependencyScanningWorkerFilesystem(
Service.getSharedCache(), RealFS, PPSkipMappings.get());
if (Service.canReuseFileManager())
Files = new FileManager(FileSystemOptions(), RealFS);
}
static llvm::Error
runWithDiags(DiagnosticOptions *DiagOpts,
llvm::function_ref<bool(DiagnosticConsumer &, DiagnosticOptions &)>
BodyShouldSucceed) {
sanitizeDiagOpts(*DiagOpts);
// Capture the emitted diagnostics and report them to the client
// in the case of a failure.
std::string DiagnosticOutput;
llvm::raw_string_ostream DiagnosticsOS(DiagnosticOutput);
TextDiagnosticPrinter DiagPrinter(DiagnosticsOS, DiagOpts);
if (BodyShouldSucceed(DiagPrinter, *DiagOpts))
return llvm::Error::success();
return llvm::make_error<llvm::StringError>(DiagnosticsOS.str(),
llvm::inconvertibleErrorCode());
}
llvm::Error DependencyScanningWorker::computeDependencies(
StringRef WorkingDirectory, const std::vector<std::string> &CommandLine,
DependencyConsumer &Consumer, llvm::Optional<StringRef> ModuleName) {
// Reset what might have been modified in the previous worker invocation.
RealFS->setCurrentWorkingDirectory(WorkingDirectory);
if (Files)
Files->setVirtualFileSystem(RealFS);
llvm::IntrusiveRefCntPtr<FileManager> CurrentFiles =
Files ? Files : new FileManager(FileSystemOptions(), RealFS);
Optional<std::vector<std::string>> ModifiedCommandLine;
if (ModuleName.hasValue()) {
ModifiedCommandLine = CommandLine;
InMemoryFS->addFile(*ModuleName, 0, llvm::MemoryBuffer::getMemBuffer(""));
ModifiedCommandLine->emplace_back(*ModuleName);
}
const std::vector<std::string> &FinalCommandLine =
ModifiedCommandLine ? *ModifiedCommandLine : CommandLine;
std::vector<const char *> FinalCCommandLine(CommandLine.size(), nullptr);
llvm::transform(CommandLine, FinalCCommandLine.begin(),
[](const std::string &Str) { return Str.c_str(); });
return runWithDiags(CreateAndPopulateDiagOpts(FinalCCommandLine).release(),
[&](DiagnosticConsumer &DC, DiagnosticOptions &DiagOpts) {
DependencyScanningAction Action(
WorkingDirectory, Consumer, DepFS,
PPSkipMappings.get(), Format, OptimizeArgs,
ModuleName);
// Create an invocation that uses the underlying file
// system to ensure that any file system requests that
// are made by the driver do not go through the
// dependency scanning filesystem.
ToolInvocation Invocation(FinalCommandLine, &Action,
CurrentFiles.get(),
PCHContainerOps);
Invocation.setDiagnosticConsumer(&DC);
Invocation.setDiagnosticOptions(&DiagOpts);
return Invocation.run();
});
}