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Frontend.cpp
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//===--- Frontend.cpp - frontend utility methods --------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2020 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
//
// This file contains utility methods for parsing and performing semantic
// on modules.
//
//===----------------------------------------------------------------------===//
#include "swift/Frontend/Frontend.h"
#include "swift/AST/ASTContext.h"
#include "swift/AST/DiagnosticsFrontend.h"
#include "swift/AST/DiagnosticsSema.h"
#include "swift/AST/FileSystem.h"
#include "swift/AST/Module.h"
#include "swift/AST/ModuleDependencies.h"
#include "swift/AST/PluginLoader.h"
#include "swift/AST/TypeCheckRequests.h"
#include "swift/Basic/Assertions.h"
#include "swift/Basic/FileTypes.h"
#include "swift/Basic/Platform.h"
#include "swift/Basic/SourceManager.h"
#include "swift/Basic/Statistic.h"
#include "swift/Frontend/CachingUtils.h"
#include "swift/Frontend/CompileJobCacheKey.h"
#include "swift/Frontend/ModuleInterfaceLoader.h"
#include "swift/Parse/Lexer.h"
#include "swift/SIL/SILModule.h"
#include "swift/SILOptimizer/PassManager/Passes.h"
#include "swift/SILOptimizer/Utils/Generics.h"
#include "swift/Serialization/SerializationOptions.h"
#include "swift/Serialization/SerializedModuleLoader.h"
#include "swift/Serialization/ScanningLoaders.h"
#include "swift/DependencyScan/ModuleDependencyScanner.h"
#include "swift/Strings.h"
#include "swift/Subsystems.h"
#include "clang/AST/ASTContext.h"
#include "llvm/ADT/Hashing.h"
#include "llvm/ADT/IntrusiveRefCntPtr.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/TargetParser/Triple.h"
#include "llvm/CAS/ActionCache.h"
#include "llvm/CAS/BuiltinUnifiedCASDatabases.h"
#include "llvm/CAS/CASFileSystem.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/Process.h"
#include "llvm/Support/VirtualOutputBackends.h"
#include "llvm/Support/ThreadPool.h"
#include <llvm/ADT/StringExtras.h>
using namespace swift;
CompilerInstance::CompilerInstance() = default;
CompilerInstance::~CompilerInstance() = default;
std::string CompilerInvocation::getPCHHash() const {
using llvm::hash_combine;
auto Code = hash_combine(LangOpts.getPCHHashComponents(),
FrontendOpts.getPCHHashComponents(),
ClangImporterOpts.getPCHHashComponents(),
SearchPathOpts.getPCHHashComponents(),
DiagnosticOpts.getPCHHashComponents(),
SILOpts.getPCHHashComponents(),
IRGenOpts.getPCHHashComponents(),
CASOpts.getPCHHashComponents());
return llvm::toString(llvm::APInt(64, Code), 36, /*Signed=*/false);
}
std::string CompilerInvocation::getModuleScanningHash() const {
using llvm::hash_combine;
auto Code = hash_combine(LangOpts.getModuleScanningHashComponents(),
FrontendOpts.getModuleScanningHashComponents(),
ClangImporterOpts.getModuleScanningHashComponents(),
SearchPathOpts.getModuleScanningHashComponents(),
DiagnosticOpts.getModuleScanningHashComponents(),
SILOpts.getModuleScanningHashComponents(),
IRGenOpts.getModuleScanningHashComponents(),
CASOpts.getModuleScanningHashComponents());
return llvm::toString(llvm::APInt(64, Code), 36, /*Signed=*/false);
}
const PrimarySpecificPaths &
CompilerInvocation::getPrimarySpecificPathsForAtMostOnePrimary() const {
return getFrontendOptions().getPrimarySpecificPathsForAtMostOnePrimary();
}
const PrimarySpecificPaths &
CompilerInvocation::getPrimarySpecificPathsForPrimary(
StringRef filename) const {
return getFrontendOptions().getPrimarySpecificPathsForPrimary(filename);
}
const PrimarySpecificPaths &
CompilerInvocation::getPrimarySpecificPathsForSourceFile(
const SourceFile &SF) const {
return getPrimarySpecificPathsForPrimary(SF.getFilename());
}
std::string CompilerInvocation::getOutputFilenameForAtMostOnePrimary() const {
return getPrimarySpecificPathsForAtMostOnePrimary().OutputFilename;
}
std::string
CompilerInvocation::getMainInputFilenameForDebugInfoForAtMostOnePrimary()
const {
return getPrimarySpecificPathsForAtMostOnePrimary()
.MainInputFilenameForDebugInfo;
}
std::string
CompilerInvocation::getClangHeaderOutputPathForAtMostOnePrimary() const {
return getPrimarySpecificPathsForAtMostOnePrimary()
.SupplementaryOutputs.ClangHeaderOutputPath;
}
std::string CompilerInvocation::getModuleOutputPathForAtMostOnePrimary() const {
return getPrimarySpecificPathsForAtMostOnePrimary()
.SupplementaryOutputs.ModuleOutputPath;
}
std::string CompilerInvocation::getReferenceDependenciesFilePathForPrimary(
StringRef filename) const {
return getPrimarySpecificPathsForPrimary(filename)
.SupplementaryOutputs.ReferenceDependenciesFilePath;
}
std::string CompilerInvocation::getConstValuesFilePathForPrimary(
StringRef filename) const {
return getPrimarySpecificPathsForPrimary(filename)
.SupplementaryOutputs.ConstValuesOutputPath;
}
std::string
CompilerInvocation::getSerializedDiagnosticsPathForAtMostOnePrimary() const {
return getPrimarySpecificPathsForAtMostOnePrimary()
.SupplementaryOutputs.SerializedDiagnosticsPath;
}
std::string CompilerInvocation::getTBDPathForWholeModule() const {
assert(getFrontendOptions().InputsAndOutputs.isWholeModule() &&
"TBDPath only makes sense when the whole module can be seen");
return getPrimarySpecificPathsForAtMostOnePrimary()
.SupplementaryOutputs.TBDPath;
}
std::string
CompilerInvocation::getModuleInterfaceOutputPathForWholeModule() const {
assert(getFrontendOptions().InputsAndOutputs.isWholeModule() &&
"ModuleInterfaceOutputPath only makes sense when the whole module "
"can be seen");
return getPrimarySpecificPathsForAtMostOnePrimary()
.SupplementaryOutputs.ModuleInterfaceOutputPath;
}
std::string
CompilerInvocation::getPrivateModuleInterfaceOutputPathForWholeModule() const {
assert(getFrontendOptions().InputsAndOutputs.isWholeModule() &&
"PrivateModuleInterfaceOutputPath only makes sense when the whole "
"module can be seen");
return getPrimarySpecificPathsForAtMostOnePrimary()
.SupplementaryOutputs.PrivateModuleInterfaceOutputPath;
}
std::string
CompilerInvocation::getPackageModuleInterfaceOutputPathForWholeModule() const {
assert(getFrontendOptions().InputsAndOutputs.isWholeModule() &&
"PackageModuleInterfaceOutputPath only makes sense when the whole "
"module can be seen");
return getPrimarySpecificPathsForAtMostOnePrimary()
.SupplementaryOutputs.PackageModuleInterfaceOutputPath;
}
std::string CompilerInvocation::getAPIDescriptorPathForWholeModule() const {
assert(
getFrontendOptions().InputsAndOutputs.isWholeModule() &&
"APIDescriptorPath only makes sense when the whole module can be seen");
return getPrimarySpecificPathsForAtMostOnePrimary()
.SupplementaryOutputs.APIDescriptorOutputPath;
}
SerializationOptions CompilerInvocation::computeSerializationOptions(
const SupplementaryOutputPaths &outs, const ModuleDecl *module) const {
const FrontendOptions &opts = getFrontendOptions();
SerializationOptions serializationOpts;
serializationOpts.OutputPath = outs.ModuleOutputPath;
serializationOpts.DocOutputPath = outs.ModuleDocOutputPath;
serializationOpts.SourceInfoOutputPath = outs.ModuleSourceInfoOutputPath;
serializationOpts.GroupInfoPath = opts.GroupInfoPath.c_str();
if (opts.SerializeBridgingHeader && !outs.ModuleOutputPath.empty())
serializationOpts.ImportedHeader = opts.ImplicitObjCHeaderPath;
serializationOpts.ModuleLinkName = opts.ModuleLinkName;
serializationOpts.UserModuleVersion = opts.UserModuleVersion;
serializationOpts.AllowableClients = opts.AllowableClients;
serializationOpts.SerializeDebugInfoSIL = opts.SerializeDebugInfoSIL;
serializationOpts.PublicDependentLibraries =
getIRGenOptions().PublicLinkLibraries;
serializationOpts.SDKName = getLangOptions().SDKName;
serializationOpts.SDKVersion = swift::getSDKBuildVersion(
getSearchPathOptions().getSDKPath());
serializationOpts.ABIDescriptorPath = outs.ABIDescriptorOutputPath.c_str();
serializationOpts.emptyABIDescriptor = opts.emptyABIDescriptor;
if (!getIRGenOptions().ForceLoadSymbolName.empty())
serializationOpts.AutolinkForceLoad = true;
// Options contain information about the developer's computer,
// so only serialize them if the module isn't going to be shipped to
// the public.
serializationOpts.SerializeOptionsForDebugging =
opts.SerializeOptionsForDebugging.value_or(
!module->isExternallyConsumed());
serializationOpts.PathObfuscator = opts.serializedPathObfuscator;
if (serializationOpts.SerializeOptionsForDebugging &&
opts.DebugPrefixSerializedDebuggingOptions) {
serializationOpts.DebuggingOptionsPrefixMap =
getIRGenOptions().DebugPrefixMap;
auto &remapper = serializationOpts.DebuggingOptionsPrefixMap;
auto remapClangPaths = [&remapper](StringRef path) {
return remapper.remapPath(path);
};
serializationOpts.ExtraClangOptions =
getClangImporterOptions().getRemappedExtraArgs(remapClangPaths);
} else {
serializationOpts.ExtraClangOptions = getClangImporterOptions().ExtraArgs;
}
if (LangOpts.ClangTarget &&
!getClangImporterOptions().DirectClangCC1ModuleBuild) {
serializationOpts.ExtraClangOptions.push_back("--target=" +
LangOpts.ClangTarget->str());
}
if (LangOpts.EnableAppExtensionRestrictions) {
serializationOpts.ExtraClangOptions.push_back("-fapplication-extension");
}
serializationOpts.PluginSearchOptions =
getSearchPathOptions().PluginSearchOpts;
serializationOpts.DisableCrossModuleIncrementalInfo =
opts.DisableCrossModuleIncrementalBuild;
serializationOpts.StaticLibrary = opts.Static;
serializationOpts.HermeticSealAtLink = opts.HermeticSealAtLink;
serializationOpts.EmbeddedSwiftModule =
LangOpts.hasFeature(Feature::Embedded);
serializationOpts.IsOSSA = getSILOptions().EnableOSSAModules;
serializationOpts.SkipNonExportableDecls =
getLangOptions().SkipNonExportableDecls;
serializationOpts.ExplicitModuleBuild = FrontendOpts.DisableImplicitModules;
serializationOpts.EnableSerializationRemarks =
getLangOptions().EnableModuleSerializationRemarks;
return serializationOpts;
}
Lowering::TypeConverter &CompilerInstance::getSILTypes() {
if (auto *tc = TheSILTypes.get())
return *tc;
auto *tc = new Lowering::TypeConverter(
*getMainModule(),
/*loweredAddresses=*/!Context->SILOpts.EnableSILOpaqueValues);
TheSILTypes.reset(tc);
return *tc;
}
void CompilerInstance::recordPrimaryInputBuffer(unsigned BufID) {
PrimaryBufferIDs.insert(BufID);
}
bool CompilerInstance::setUpASTContextIfNeeded() {
if (FrontendOptions::doesActionBuildModuleFromInterface(
Invocation.getFrontendOptions().RequestedAction) &&
!Invocation.getFrontendOptions().ExplicitInterfaceBuild) {
// Compiling a module interface from source uses its own CompilerInstance
// with options read from the input file. Don't bother setting up an
// ASTContext at this level.
return false;
}
// For the time being, we only need to record dependencies in batch mode
// and single file builds.
Invocation.getLangOptions().RecordRequestReferences
= !isWholeModuleCompilation();
Context.reset(ASTContext::get(
Invocation.getLangOptions(), Invocation.getTypeCheckerOptions(),
Invocation.getSILOptions(), Invocation.getSearchPathOptions(),
Invocation.getClangImporterOptions(), Invocation.getSymbolGraphOptions(),
Invocation.getCASOptions(), Invocation.getSerializationOptions(),
SourceMgr, Diagnostics, OutputBackend));
if (!Invocation.getFrontendOptions().ModuleAliasMap.empty())
Context->setModuleAliases(Invocation.getFrontendOptions().ModuleAliasMap);
registerParseRequestFunctions(Context->evaluator);
registerTypeCheckerRequestFunctions(Context->evaluator);
registerClangImporterRequestFunctions(Context->evaluator);
registerConstExtractRequestFunctions(Context->evaluator);
registerSILGenRequestFunctions(Context->evaluator);
registerSILOptimizerRequestFunctions(Context->evaluator);
registerTBDGenRequestFunctions(Context->evaluator);
registerIRGenRequestFunctions(Context->evaluator);
// Migrator, indexing and typo correction need some IDE requests.
// The integrated REPL needs IDE requests for completion.
if (Invocation.getMigratorOptions().shouldRunMigrator() ||
!Invocation.getFrontendOptions().IndexStorePath.empty() ||
Invocation.getLangOptions().TypoCorrectionLimit ||
Invocation.getFrontendOptions().RequestedAction ==
FrontendOptions::ActionType::REPL) {
registerIDERequestFunctions(Context->evaluator);
}
registerIRGenSILTransforms(*Context);
if (Invocation.getFrontendOptions().RequestedAction ==
FrontendOptions::ActionType::MergeModules ||
Invocation.getLangOptions().DebuggerSupport)
Invocation.getLangOptions().EnableDeserializationSafety = false;
if (setUpModuleLoaders())
return true;
if (setUpPluginLoader())
return true;
return false;
}
void CompilerInstance::setupStatsReporter() {
const auto &Invoke = getInvocation();
const std::string &StatsOutputDir =
Invoke.getFrontendOptions().StatsOutputDir;
if (StatsOutputDir.empty())
return;
auto silOptModeArgStr = [](OptimizationMode mode) -> StringRef {
switch (mode) {
case OptimizationMode::ForSpeed:
return "O";
case OptimizationMode::ForSize:
return "Osize";
default:
return "Onone";
}
};
auto getClangSourceManager = [](ASTContext &Ctx) -> clang::SourceManager * {
if (auto *clangImporter = static_cast<ClangImporter *>(
Ctx.getClangModuleLoader())) {
return &clangImporter->getClangASTContext().getSourceManager();
}
return nullptr;
};
const auto &FEOpts = Invoke.getFrontendOptions();
const auto &LangOpts = Invoke.getLangOptions();
const auto &SILOpts = Invoke.getSILOptions();
const std::string &OutFile =
FEOpts.InputsAndOutputs.lastInputProducingOutput().outputFilename();
auto Reporter = std::make_unique<UnifiedStatsReporter>(
"swift-frontend",
FEOpts.ModuleName,
FEOpts.InputsAndOutputs.getStatsFileMangledInputName(),
LangOpts.Target.normalize(),
llvm::sys::path::extension(OutFile),
silOptModeArgStr(SILOpts.OptMode),
StatsOutputDir,
&getSourceMgr(),
getClangSourceManager(getASTContext()),
Invoke.getFrontendOptions().FineGrainedTimers,
Invoke.getFrontendOptions().TraceStats,
Invoke.getFrontendOptions().ProfileEvents,
Invoke.getFrontendOptions().ProfileEntities,
Invoke.getFrontendOptions().PrintZeroStats);
// Hand the stats reporter down to the ASTContext so the rest of the compiler
// can use it.
getASTContext().setStatsReporter(Reporter.get());
Diagnostics.setStatsReporter(Reporter.get());
Stats = std::move(Reporter);
}
bool CompilerInstance::setupDiagnosticVerifierIfNeeded() {
auto &diagOpts = Invocation.getDiagnosticOptions();
bool hadError = false;
if (diagOpts.VerifyMode != DiagnosticOptions::NoVerify) {
DiagVerifier = std::make_unique<DiagnosticVerifier>(
SourceMgr, InputSourceCodeBufferIDs,
diagOpts.VerifyMode == DiagnosticOptions::VerifyAndApplyFixes,
diagOpts.VerifyIgnoreUnknown, diagOpts.UseColor,
diagOpts.AdditionalDiagnosticVerifierPrefixes);
for (const auto &filename : diagOpts.AdditionalVerifierFiles) {
auto result = getFileSystem().getBufferForFile(filename);
if (!result) {
Diagnostics.diagnose(SourceLoc(), diag::error_open_input_file,
filename, result.getError().message());
hadError |= true;
continue;
}
auto bufferID = SourceMgr.addNewSourceBuffer(std::move(result.get()));
DiagVerifier->appendAdditionalBufferID(bufferID);
}
addDiagnosticConsumer(DiagVerifier.get());
}
return hadError;
}
void CompilerInstance::setupDependencyTrackerIfNeeded() {
assert(!Context && "Must be called before the ASTContext is created");
const auto &Invocation = getInvocation();
const auto &opts = Invocation.getFrontendOptions();
// Note that we may track dependencies even when we don't need to write them
// directly; in particular, -track-system-dependencies affects how module
// interfaces get loaded, and so we need to be consistently tracking system
// dependencies throughout the compiler.
auto collectionMode = opts.IntermoduleDependencyTracking;
if (!collectionMode) {
// If we have an output path specified, but no other tracking options,
// default to non-system dependency tracking.
if (opts.InputsAndOutputs.hasDependencyTrackerPath() ||
!opts.IndexStorePath.empty()) {
collectionMode = IntermoduleDepTrackingMode::ExcludeSystem;
}
}
if (!collectionMode)
return;
DepTracker = std::make_unique<DependencyTracker>(*collectionMode);
}
bool CompilerInstance::setupCASIfNeeded(ArrayRef<const char *> Args) {
if (!getInvocation().requiresCAS())
return false;
const auto &Opts = getInvocation().getCASOptions();
auto MaybeDB= Opts.CASOpts.getOrCreateDatabases();
if (!MaybeDB) {
Diagnostics.diagnose(SourceLoc(), diag::error_cas,
toString(MaybeDB.takeError()));
return true;
}
std::tie(CAS, ResultCache) = *MaybeDB;
// create baseline key.
auto BaseKey = createCompileJobBaseCacheKey(*CAS, Args);
if (!BaseKey) {
Diagnostics.diagnose(SourceLoc(), diag::error_cas,
toString(BaseKey.takeError()));
return true;
}
CompileJobBaseKey = *BaseKey;
return false;
}
void CompilerInstance::setupOutputBackend() {
// Skip if output backend is not setup, default to OnDiskOutputBackend.
if (OutputBackend)
return;
OutputBackend =
llvm::makeIntrusiveRefCnt<llvm::vfs::OnDiskOutputBackend>();
// Mirror the output into CAS.
if (supportCaching()) {
auto &InAndOuts = Invocation.getFrontendOptions().InputsAndOutputs;
CASOutputBackend = createSwiftCachingOutputBackend(
*CAS, *ResultCache, *CompileJobBaseKey, InAndOuts,
Invocation.getFrontendOptions(),
Invocation.getFrontendOptions().RequestedAction);
if (Invocation.getIRGenOptions().UseCASBackend) {
auto OutputFiles = InAndOuts.copyOutputFilenames();
std::unordered_set<std::string> OutputFileSet(
std::make_move_iterator(OutputFiles.begin()),
std::make_move_iterator(OutputFiles.end()));
// Filter the object file output if MCCAS is enabled, we do not want to
// store the object file itself, but store the MCCAS CASID instead.
auto FilterBackend = llvm::vfs::makeFilteringOutputBackend(
CASOutputBackend,
[&, OutputFileSet](StringRef Path,
std::optional<llvm::vfs::OutputConfig> Config) {
if (InAndOuts.getPrincipalOutputType() != file_types::ID::TY_Object)
return true;
return !(OutputFileSet.find(Path.str()) != OutputFileSet.end());
});
OutputBackend =
llvm::vfs::makeMirroringOutputBackend(OutputBackend, FilterBackend);
return;
}
OutputBackend =
llvm::vfs::makeMirroringOutputBackend(OutputBackend, CASOutputBackend);
}
// Setup verification backend.
// Create a mirroring outputbackend to produce hash for output files.
// We cannot skip disk here since swift compiler is expecting to read back
// some output file in later stages.
if (Invocation.getFrontendOptions().DeterministicCheck) {
HashBackend = llvm::makeIntrusiveRefCnt<HashBackendTy>();
OutputBackend =
llvm::vfs::makeMirroringOutputBackend(OutputBackend, HashBackend);
}
}
void CompilerInstance::setupCachingDiagnosticsProcessorIfNeeded() {
if (!supportCaching())
return;
// Only setup if using CAS.
CDP = std::make_unique<CachingDiagnosticsProcessor>(*this);
CDP->startDiagnosticCapture();
}
bool CompilerInstance::setup(const CompilerInvocation &Invoke,
std::string &Error, ArrayRef<const char *> Args) {
Invocation = Invoke;
if (setupCASIfNeeded(Args)) {
Error = "Setting up CAS failed";
return true;
}
setupDependencyTrackerIfNeeded();
setupOutputBackend();
// If initializing the overlay file system fails there's no sense in
// continuing because the compiler will read the wrong files.
if (setUpVirtualFileSystemOverlays()) {
Error = "Setting up virtual file system overlays failed";
return true;
}
setUpLLVMArguments();
setUpDiagnosticOptions();
assert(Lexer::isIdentifier(Invocation.getModuleName()));
if (setUpInputs()) {
Error = "Setting up inputs failed";
return true;
}
if (setUpASTContextIfNeeded()) {
Error = "Setting up ASTContext failed";
return true;
}
if (hasASTContext()) {
setupStatsReporter();
}
if (setupDiagnosticVerifierIfNeeded()) {
Error = "Setting up diagnostics verifier failed";
return true;
}
// Setup caching diagnostics processor. It should be setup after all other
// DiagConsumers are added.
setupCachingDiagnosticsProcessorIfNeeded();
// Dump module search paths if -Rmodule-loading is on.
const auto &LangOpts = Invocation.getLangOptions();
if (LangOpts.EnableModuleLoadingRemarks) {
Invocation.getSearchPathOptions().dump(LangOpts.Target.isOSDarwin());
}
if (LangOpts.OpenSourcesAsVolatile) {
this->getSourceMgr().setOpenSourcesAsVolatile();
}
// If we expect an implicit stdlib import, load in the standard library. If we
// either fail to find it or encounter an error while loading it, bail early. Continuing will at best
// trigger a bunch of other errors due to the stdlib being missing, or at
// worst crash downstream as many call sites don't currently handle a missing
// stdlib.
if (loadStdlibIfNeeded()) {
Error = "Loading the standard library failed";
return true;
}
return false;
}
bool CompilerInstance::setupForReplay(const CompilerInvocation &Invoke,
std::string &Error,
ArrayRef<const char *> Args) {
// This is the fast path for setup an instance for replay but cannot run
// regular compilation.
Invocation = Invoke;
if (setupCASIfNeeded(Args)) {
Error = "Setting up CAS failed";
return true;
}
setupOutputBackend();
setupCachingDiagnosticsProcessorIfNeeded();
return false;
}
bool CompilerInstance::setUpVirtualFileSystemOverlays() {
const auto &CASOpts = getInvocation().getCASOptions();
if (CASOpts.EnableCaching && !CASOpts.HasImmutableFileSystem &&
FrontendOptions::supportCompilationCaching(
Invocation.getFrontendOptions().RequestedAction)) {
Diagnostics.diagnose(SourceLoc(), diag::error_caching_no_cas_fs);
return true;
}
if (Invocation.getCASOptions().requireCASFS()) {
if (!CASOpts.CASFSRootIDs.empty() || !CASOpts.ClangIncludeTrees.empty() ||
!CASOpts.ClangIncludeTreeFileList.empty()) {
// Set up CASFS as BaseFS.
auto FS = createCASFileSystem(*CAS, CASOpts.CASFSRootIDs,
CASOpts.ClangIncludeTrees,
CASOpts.ClangIncludeTreeFileList);
if (!FS) {
Diagnostics.diagnose(SourceLoc(), diag::error_cas,
toString(FS.takeError()));
return true;
}
SourceMgr.setFileSystem(std::move(*FS));
}
// If we need to load any files from CAS, try load it now and overlay it.
llvm::IntrusiveRefCntPtr<llvm::vfs::InMemoryFileSystem> MemFS =
new llvm::vfs::InMemoryFileSystem();
const auto &ClangOpts = getInvocation().getClangImporterOptions();
if (!CASOpts.BridgingHeaderPCHCacheKey.empty()) {
if (auto loadedBuffer = loadCachedCompileResultFromCacheKey(
getObjectStore(), getActionCache(), Diagnostics,
CASOpts.BridgingHeaderPCHCacheKey, file_types::ID::TY_PCH,
ClangOpts.BridgingHeader))
MemFS->addFile(Invocation.getClangImporterOptions().BridgingHeader, 0,
std::move(loadedBuffer));
else
Diagnostics.diagnose(
SourceLoc(), diag::error_load_input_from_cas,
Invocation.getClangImporterOptions().BridgingHeader);
}
if (!CASOpts.InputFileKey.empty()) {
if (Invocation.getFrontendOptions()
.InputsAndOutputs.getAllInputs()
.size() != 1)
Diagnostics.diagnose(SourceLoc(),
diag::error_wrong_input_num_for_input_file_key);
else {
auto InputPath = Invocation.getFrontendOptions()
.InputsAndOutputs.getFilenameOfFirstInput();
auto Type = file_types::lookupTypeFromFilename(
llvm::sys::path::filename(InputPath));
if (auto loadedBuffer = loadCachedCompileResultFromCacheKey(
getObjectStore(), getActionCache(), Diagnostics,
CASOpts.InputFileKey, Type, InputPath))
MemFS->addFile(InputPath, 0, std::move(loadedBuffer));
else
Diagnostics.diagnose(SourceLoc(), diag::error_load_input_from_cas,
InputPath);
}
}
llvm::IntrusiveRefCntPtr<llvm::vfs::OverlayFileSystem> OverlayVFS =
new llvm::vfs::OverlayFileSystem(SourceMgr.getFileSystem());
OverlayVFS->pushOverlay(MemFS);
SourceMgr.setFileSystem(std::move(OverlayVFS));
}
auto ExpectedOverlay =
Invocation.getSearchPathOptions().makeOverlayFileSystem(
SourceMgr.getFileSystem());
if (!ExpectedOverlay) {
llvm::handleAllErrors(
ExpectedOverlay.takeError(), [&](const llvm::FileError &FE) {
if (FE.convertToErrorCode() == std::errc::no_such_file_or_directory) {
Diagnostics.diagnose(SourceLoc(), diag::cannot_open_file,
FE.getFileName(), FE.messageWithoutFileInfo());
} else {
Diagnostics.diagnose(SourceLoc(), diag::invalid_vfs_overlay_file,
FE.getFileName());
}
});
return true;
}
SourceMgr.setFileSystem(*ExpectedOverlay);
return false;
}
void CompilerInstance::setUpLLVMArguments() {
// Dependency scanning has no need for LLVM options, and
// must not use `llvm::cl::` utilities operating on global state
// since dependency scanning is multi-threaded.
if (Invocation.getFrontendOptions().RequestedAction !=
FrontendOptions::ActionType::ScanDependencies) {
// Honor -Xllvm.
if (!Invocation.getFrontendOptions().LLVMArgs.empty()) {
llvm::SmallVector<const char *, 4> Args;
Args.push_back("swift (LLVM option parsing)");
for (unsigned i = 0, e = Invocation.getFrontendOptions().LLVMArgs.size();
i != e; ++i)
Args.push_back(Invocation.getFrontendOptions().LLVMArgs[i].c_str());
Args.push_back(nullptr);
llvm::cl::ParseCommandLineOptions(Args.size()-1, Args.data());
}
}
}
void CompilerInstance::setUpDiagnosticOptions() {
if (Invocation.getDiagnosticOptions().ShowDiagnosticsAfterFatalError) {
Diagnostics.setShowDiagnosticsAfterFatalError();
}
if (Invocation.getDiagnosticOptions().SuppressWarnings) {
Diagnostics.setSuppressWarnings(true);
}
if (Invocation.getDiagnosticOptions().SuppressRemarks) {
Diagnostics.setSuppressRemarks(true);
}
Diagnostics.setWarningsAsErrorsRules(
Invocation.getDiagnosticOptions().WarningsAsErrorsRules);
Diagnostics.setPrintDiagnosticNamesMode(
Invocation.getDiagnosticOptions().PrintDiagnosticNames);
Diagnostics.setDiagnosticDocumentationPath(
Invocation.getDiagnosticOptions().DiagnosticDocumentationPath);
Diagnostics.setLanguageVersion(
Invocation.getLangOptions().EffectiveLanguageVersion);
if (!Invocation.getDiagnosticOptions().LocalizationCode.empty()) {
Diagnostics.setLocalization(
Invocation.getDiagnosticOptions().LocalizationCode,
Invocation.getDiagnosticOptions().LocalizationPath);
}
}
// The ordering of ModuleLoaders is important!
//
// 1. SourceLoader: This is a hack and only the compiler's tests are using it,
// to avoid writing repetitive code involving generating modules/interfaces.
// Ideally, we'd get rid of it.
// 2. MemoryBufferSerializedModuleLoader: This is used by LLDB, because it might
// already have the module available in memory.
// 3. ExplicitSwiftModuleLoader: Loads a serialized module if it can, provided
// this modules was specified as an explicit input to the compiler.
// 4. ModuleInterfaceLoader: Tries to find an up-to-date swiftmodule. If it
// succeeds, it issues a particular "error" (see
// [NOTE: ModuleInterfaceLoader-defer-to-ImplicitSerializedModuleLoader]),
// which is interpreted by the overarching loader as a command to use the
// ImplicitSerializedModuleLoader. If we failed to find a .swiftmodule,
// this falls back to using an interface. Actual errors lead to diagnostics.
// 5. ImplicitSerializedModuleLoader: Loads a serialized module if it can.
// Used for implicit loading of modules from the compiler's search paths.
// 6. ClangImporter: This must come after all the Swift module loaders because
// in the presence of overlays and mixed-source frameworks, we want to prefer
// the overlay or framework module over the underlying Clang module.
bool CompilerInstance::setUpModuleLoaders() {
if (hasSourceImport()) {
bool enableLibraryEvolution =
Invocation.getFrontendOptions().EnableLibraryEvolution;
Context->addModuleLoader(SourceLoader::create(*Context,
enableLibraryEvolution,
getDependencyTracker()));
}
auto MLM = Invocation.getSearchPathOptions().ModuleLoadMode;
auto IgnoreSourceInfoFile =
Invocation.getFrontendOptions().IgnoreSwiftSourceInfo;
if (Invocation.getLangOptions().EnableMemoryBufferImporter) {
auto MemoryBufferLoader = MemoryBufferSerializedModuleLoader::create(
*Context, getDependencyTracker(), MLM, IgnoreSourceInfoFile);
this->MemoryBufferLoader = MemoryBufferLoader.get();
Context->addModuleLoader(std::move(MemoryBufferLoader));
}
// If using `-explicit-swift-module-map-file`, create the explicit loader
// before creating `ClangImporter` because the entries in the map influence
// the Clang flags. The loader is added to the context below.
std::unique_ptr<SerializedModuleLoaderBase> ESML = nullptr;
bool ExplicitModuleBuild =
Invocation.getFrontendOptions().DisableImplicitModules;
if (ExplicitModuleBuild ||
!Invocation.getSearchPathOptions().ExplicitSwiftModuleMapPath.empty() ||
!Invocation.getSearchPathOptions().ExplicitSwiftModuleInputs.empty()) {
if (Invocation.getCASOptions().EnableCaching)
ESML = ExplicitCASModuleLoader::create(
*Context, getObjectStore(), getActionCache(), getDependencyTracker(),
MLM, Invocation.getSearchPathOptions().ExplicitSwiftModuleMapPath,
Invocation.getSearchPathOptions().ExplicitSwiftModuleInputs,
IgnoreSourceInfoFile);
else
ESML = ExplicitSwiftModuleLoader::create(
*Context, getDependencyTracker(), MLM,
Invocation.getSearchPathOptions().ExplicitSwiftModuleMapPath,
Invocation.getSearchPathOptions().ExplicitSwiftModuleInputs,
IgnoreSourceInfoFile);
}
// Wire up the Clang importer. If the user has specified an SDK, use it.
// Otherwise, we just keep it around as our interface to Clang's ABI
// knowledge.
std::unique_ptr<ClangImporter> clangImporter =
ClangImporter::create(*Context, Invocation.getPCHHash(),
getDependencyTracker());
if (!clangImporter) {
Diagnostics.diagnose(SourceLoc(), diag::error_clang_importer_create_fail);
return true;
}
// Configure ModuleInterfaceChecker for the ASTContext.
auto CacheFromInvocation = getInvocation().getClangModuleCachePath();
auto const &Clang = clangImporter->getClangInstance();
std::string ModuleCachePath = CacheFromInvocation.empty()
? getModuleCachePathFromClang(Clang)
: CacheFromInvocation.str();
auto &FEOpts = Invocation.getFrontendOptions();
ModuleInterfaceLoaderOptions LoaderOpts(FEOpts);
Context->addModuleInterfaceChecker(
std::make_unique<ModuleInterfaceCheckerImpl>(
*Context, ModuleCachePath, FEOpts.PrebuiltModuleCachePath,
FEOpts.BackupModuleInterfaceDir, LoaderOpts,
RequireOSSAModules_t(Invocation.getSILOptions())));
// Install an explicit module loader if it was created earlier.
if (ESML) {
this->DefaultSerializedLoader = ESML.get();
Context->addModuleLoader(std::move(ESML));
}
if (!ExplicitModuleBuild) {
if (MLM != ModuleLoadingMode::OnlySerialized) {
// We only need ModuleInterfaceLoader for implicit modules.
auto PIML = ModuleInterfaceLoader::create(
*Context, *static_cast<ModuleInterfaceCheckerImpl*>(Context
->getModuleInterfaceChecker()), getDependencyTracker(), MLM,
FEOpts.PreferInterfaceForModules, IgnoreSourceInfoFile);
Context->addModuleLoader(std::move(PIML), false, false, true);
}
std::unique_ptr<ImplicitSerializedModuleLoader> ISML =
ImplicitSerializedModuleLoader::create(*Context, getDependencyTracker(), MLM,
IgnoreSourceInfoFile);
this->DefaultSerializedLoader = ISML.get();
Context->addModuleLoader(std::move(ISML));
}
Context->addModuleLoader(std::move(clangImporter), /*isClang*/ true);
// When scanning for dependencies, we must add the scanner placeholder loader in order to
// handle ASTContext operations such as canImportModule
if (Invocation.getFrontendOptions().RequestedAction ==
FrontendOptions::ActionType::ScanDependencies) {
auto ClangModuleCachePath = getModuleCachePathFromClang(
Context->getClangModuleLoader()->getClangInstance());
auto &FEOpts = Invocation.getFrontendOptions();
ModuleInterfaceLoaderOptions LoaderOpts(FEOpts);
InterfaceSubContextDelegateImpl ASTDelegate(
Context->SourceMgr, &Context->Diags, Context->SearchPathOpts,
Context->LangOpts, Context->ClangImporterOpts, Context->CASOpts,
LoaderOpts,
/*buildModuleCacheDirIfAbsent*/ false, ClangModuleCachePath,
FEOpts.PrebuiltModuleCachePath, FEOpts.BackupModuleInterfaceDir,
FEOpts.SerializeModuleInterfaceDependencyHashes,
FEOpts.shouldTrackSystemDependencies(),
RequireOSSAModules_t(Invocation.getSILOptions()));
auto mainModuleName = Context->getIdentifier(FEOpts.ModuleName);
std::unique_ptr<PlaceholderSwiftModuleScanner> PSMS =
std::make_unique<PlaceholderSwiftModuleScanner>(
*Context, MLM, mainModuleName,
Context->SearchPathOpts.PlaceholderDependencyModuleMap, ASTDelegate,
getInvocation().getFrontendOptions().ExplicitModulesOutputPath);
Context->addModuleLoader(std::move(PSMS));
}
return false;
}
bool CompilerInstance::setUpPluginLoader() {
/// FIXME: If Invocation has 'PluginRegistry', we can set it. But should we?
auto loader = std::make_unique<PluginLoader>(
*Context, getDependencyTracker(),
Invocation.getFrontendOptions().DisableSandbox);
Context->setPluginLoader(std::move(loader));
return false;
}
std::optional<unsigned> CompilerInstance::setUpIDEInspectionTargetBuffer() {
std::optional<unsigned> ideInspectionTargetBufferID;
auto ideInspectionTarget = Invocation.getIDEInspectionTarget();
if (ideInspectionTarget.first) {
auto memBuf = ideInspectionTarget.first;
// CompilerInvocation doesn't own the buffers, copy to a new buffer.
ideInspectionTargetBufferID = SourceMgr.addMemBufferCopy(memBuf);
InputSourceCodeBufferIDs.push_back(*ideInspectionTargetBufferID);
SourceMgr.setIDEInspectionTarget(*ideInspectionTargetBufferID,
ideInspectionTarget.second);
}
return ideInspectionTargetBufferID;
}
SourceFile *CompilerInstance::getIDEInspectionFile() const {
auto *mod = getMainModule();
auto &eval = mod->getASTContext().evaluator;
return evaluateOrDefault(eval, IDEInspectionFileRequest{mod}, nullptr);
}
static inline bool isPCHFilenameExtension(StringRef path) {
return llvm::sys::path::extension(path)
.ends_with(file_types::getExtension(file_types::TY_PCH));
}
std::string CompilerInstance::getBridgingHeaderPath() const {
const FrontendOptions &opts = Invocation.getFrontendOptions();
if (!isPCHFilenameExtension(opts.ImplicitObjCHeaderPath))
return opts.ImplicitObjCHeaderPath;
auto clangImporter =
static_cast<ClangImporter *>(getASTContext().getClangModuleLoader());
// No clang importer created. Report error?
if (!clangImporter)
return std::string();
return clangImporter->getOriginalSourceFile(opts.ImplicitObjCHeaderPath);
}
bool CompilerInstance::setUpInputs() {
// There is no input file when building PCM using ClangIncludeTree.
if (Invocation.getFrontendOptions().RequestedAction ==
FrontendOptions::ActionType::EmitPCM &&
Invocation.getClangImporterOptions().HasClangIncludeTreeRoot)
return false;
// Adds to InputSourceCodeBufferIDs, so may need to happen before the
// per-input setup.
const std::optional<unsigned> ideInspectionTargetBufferID =
setUpIDEInspectionTargetBuffer();
const auto &Inputs =
Invocation.getFrontendOptions().InputsAndOutputs.getAllInputs();
const bool shouldRecover = Invocation.getFrontendOptions()
.InputsAndOutputs.shouldRecoverMissingInputs();
bool hasFailed = false;
for (const InputFile &input : Inputs) {
bool failed = false;
std::optional<unsigned> bufferID =
getRecordedBufferID(input, shouldRecover, failed);
hasFailed |= failed;
if (!bufferID.has_value() || !input.isPrimary())
continue;
recordPrimaryInputBuffer(*bufferID);
}
if (hasFailed)
return true;
// Set the primary file to the IDE inspection point if one exists.
if (ideInspectionTargetBufferID.has_value() &&
!isPrimaryInput(*ideInspectionTargetBufferID)) {
assert(PrimaryBufferIDs.empty() && "re-setting PrimaryBufferID");
recordPrimaryInputBuffer(*ideInspectionTargetBufferID);
}
return false;
}
std::optional<unsigned>
CompilerInstance::getRecordedBufferID(const InputFile &input,
const bool shouldRecover, bool &failed) {
if (!input.getBuffer()) {
if (std::optional<unsigned> existingBufferID =
SourceMgr.getIDForBufferIdentifier(input.getFileName())) {
return existingBufferID;
}
}
auto buffers = getInputBuffersIfPresent(input);
// Recover by dummy buffer if requested.
if (!buffers.has_value() && shouldRecover &&
input.getType() == file_types::TY_Swift) {
buffers = ModuleBuffers(llvm::MemoryBuffer::getMemBuffer(
"// missing file\n", input.getFileName()));
}