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CompilerInvocation.cpp
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//===--- CompilerInvocation.cpp - CompilerInvocation methods --------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2025 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
//
//===----------------------------------------------------------------------===//
#include "clang/Driver/Driver.h"
#include "swift/AST/SILOptions.h"
#include "swift/Basic/DiagnosticOptions.h"
#include "swift/Frontend/Frontend.h"
#include "ArgsToFrontendOptionsConverter.h"
#include "swift/AST/DiagnosticsFrontend.h"
#include "swift/Basic/Assertions.h"
#include "swift/Basic/Feature.h"
#include "swift/Basic/Platform.h"
#include "swift/Basic/Version.h"
#include "swift/Option/Options.h"
#include "swift/Option/SanitizerOptions.h"
#include "swift/Parse/Lexer.h"
#include "swift/Parse/ParseVersion.h"
#include "swift/SIL/SILBridging.h"
#include "swift/Strings.h"
#include "swift/SymbolGraphGen/SymbolGraphOptions.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Option/Arg.h"
#include "llvm/Option/ArgList.h"
#include "llvm/Option/Option.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/LineIterator.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/Process.h"
#include "llvm/Support/VersionTuple.h"
#include "llvm/Support/WithColor.h"
#include "llvm/TargetParser/Triple.h"
using namespace swift;
using namespace llvm::opt;
/// The path for Swift libraries in the OS on Darwin.
#define DARWIN_OS_LIBRARY_PATH "/usr/lib/swift"
static constexpr const char *const localeCodes[] = {
#define SUPPORTED_LOCALE(Code, Language) #Code,
#include "swift/AST/LocalizationLanguages.def"
};
swift::CompilerInvocation::CompilerInvocation() {
setTargetTriple(llvm::sys::getDefaultTargetTriple());
}
/// Converts a llvm::Triple to a llvm::VersionTuple.
static llvm::VersionTuple
getVersionTuple(const llvm::Triple &triple) {
if (triple.isMacOSX()) {
llvm::VersionTuple OSVersion;
triple.getMacOSXVersion(OSVersion);
return OSVersion;
}
return triple.getOSVersion();
}
void CompilerInvocation::computeRuntimeResourcePathFromExecutablePath(
StringRef mainExecutablePath, bool shared,
llvm::SmallVectorImpl<char> &runtimeResourcePath) {
runtimeResourcePath.append(mainExecutablePath.begin(),
mainExecutablePath.end());
llvm::sys::path::remove_filename(runtimeResourcePath); // Remove /swift
llvm::sys::path::remove_filename(runtimeResourcePath); // Remove /bin
appendSwiftLibDir(runtimeResourcePath, shared);
}
void CompilerInvocation::appendSwiftLibDir(llvm::SmallVectorImpl<char> &path,
bool shared) {
llvm::sys::path::append(path, "lib", shared ? "swift" : "swift_static");
}
void CompilerInvocation::setMainExecutablePath(StringRef Path) {
FrontendOpts.MainExecutablePath = Path.str();
llvm::SmallString<128> LibPath;
computeRuntimeResourcePathFromExecutablePath(
Path, FrontendOpts.UseSharedResourceFolder, LibPath);
setRuntimeResourcePath(LibPath.str());
llvm::SmallString<128> clangPath(Path);
llvm::sys::path::remove_filename(clangPath);
llvm::sys::path::append(clangPath, "clang");
ClangImporterOpts.clangPath = std::string(clangPath);
}
static std::string
getVersionedPrebuiltModulePath(std::optional<llvm::VersionTuple> sdkVer,
StringRef defaultPrebuiltPath) {
if (!sdkVer.has_value())
return defaultPrebuiltPath.str();
std::string versionStr = sdkVer->getAsString();
StringRef vs = versionStr;
do {
SmallString<64> pathWithSDKVer = defaultPrebuiltPath;
llvm::sys::path::append(pathWithSDKVer, vs);
if (llvm::sys::fs::exists(pathWithSDKVer)) {
return pathWithSDKVer.str().str();
} else if (vs.ends_with(".0")) {
vs = vs.substr(0, vs.size() - 2);
} else {
return defaultPrebuiltPath.str();
}
} while(true);
}
std::string CompilerInvocation::computePrebuiltCachePath(
StringRef RuntimeResourcePath, llvm::Triple target,
std::optional<llvm::VersionTuple> sdkVer) {
SmallString<64> defaultPrebuiltPath{RuntimeResourcePath};
StringRef platform;
if (tripleIsMacCatalystEnvironment(target)) {
// The prebuilt cache for macCatalyst is the same as the one for macOS, not
// iOS or a separate location of its own.
platform = "macosx";
} else {
platform = getPlatformNameForTriple(target);
}
llvm::sys::path::append(defaultPrebuiltPath, platform, "prebuilt-modules");
// If the SDK version is given, we should check if SDK-versioned prebuilt
// module cache is available and use it if so.
return getVersionedPrebuiltModulePath(sdkVer, defaultPrebuiltPath);
}
void CompilerInvocation::setDefaultPrebuiltCacheIfNecessary() {
if (!FrontendOpts.PrebuiltModuleCachePath.empty())
return;
if (SearchPathOpts.RuntimeResourcePath.empty())
return;
FrontendOpts.PrebuiltModuleCachePath = computePrebuiltCachePath(
SearchPathOpts.RuntimeResourcePath, LangOpts.Target, LangOpts.SDKVersion);
if (!FrontendOpts.PrebuiltModuleCachePath.empty())
return;
StringRef anchor = "prebuilt-modules";
assert(((StringRef)FrontendOpts.PrebuiltModuleCachePath).contains(anchor));
auto pair = ((StringRef)FrontendOpts.PrebuiltModuleCachePath).split(anchor);
FrontendOpts.BackupModuleInterfaceDir =
(llvm::Twine(pair.first) + "preferred-interfaces" + pair.second).str();
}
void CompilerInvocation::setDefaultBlocklistsIfNecessary() {
if (!LangOpts.BlocklistConfigFilePaths.empty())
return;
if (SearchPathOpts.RuntimeResourcePath.empty())
return;
// XcodeDefault.xctoolchain/usr/lib/swift
SmallString<64> blocklistDir{SearchPathOpts.RuntimeResourcePath};
// XcodeDefault.xctoolchain/usr/lib
llvm::sys::path::remove_filename(blocklistDir);
// XcodeDefault.xctoolchain/usr
llvm::sys::path::remove_filename(blocklistDir);
// XcodeDefault.xctoolchain/usr/local/lib/swift/blocklists
llvm::sys::path::append(blocklistDir, "local", "lib", "swift", "blocklists");
std::error_code EC;
if (llvm::sys::fs::is_directory(blocklistDir)) {
for (llvm::sys::fs::directory_iterator F(blocklistDir, EC), FE;
F != FE; F.increment(EC)) {
StringRef ext = llvm::sys::path::extension(F->path());
if (ext == "yml" || ext == "yaml") {
LangOpts.BlocklistConfigFilePaths.push_back(F->path());
}
}
}
}
void CompilerInvocation::setDefaultInProcessPluginServerPathIfNecessary() {
if (!SearchPathOpts.InProcessPluginServerPath.empty())
return;
if (FrontendOpts.MainExecutablePath.empty())
return;
// '/usr/bin/swift'
SmallString<64> serverLibPath{FrontendOpts.MainExecutablePath};
llvm::sys::path::remove_filename(serverLibPath); // remove 'swift'
#if defined(_WIN32)
// Windows: usr\bin\SwiftInProcPluginServer.dll
llvm::sys::path::append(serverLibPath, "SwiftInProcPluginServer.dll");
#elif defined(__APPLE__)
// Darwin: usr/lib/swift/host/libSwiftInProcPluginServer.dylib
llvm::sys::path::remove_filename(serverLibPath); // remove 'bin'
llvm::sys::path::append(serverLibPath, "lib", "swift", "host");
llvm::sys::path::append(serverLibPath, "libSwiftInProcPluginServer.dylib");
#else
// Other: usr/lib/swift/host/libSwiftInProcPluginServer.so
llvm::sys::path::remove_filename(serverLibPath); // remove 'bin'
llvm::sys::path::append(serverLibPath, "lib", "swift", "host");
llvm::sys::path::append(serverLibPath, "libSwiftInProcPluginServer.so");
#endif
SearchPathOpts.InProcessPluginServerPath = serverLibPath.str();
}
static void updateRuntimeLibraryPaths(SearchPathOptions &SearchPathOpts,
const FrontendOptions &FrontendOpts,
const LangOptions &LangOpts) {
const llvm::Triple &Triple = LangOpts.Target;
llvm::SmallString<128> LibPath(SearchPathOpts.RuntimeResourcePath);
StringRef LibSubDir = getPlatformNameForTriple(Triple);
if (tripleIsMacCatalystEnvironment(Triple))
LibSubDir = "maccatalyst";
if (LangOpts.hasFeature(Feature::Embedded))
LibSubDir = "embedded";
SearchPathOpts.RuntimeLibraryPaths.clear();
#if defined(_WIN32)
// Resource path looks like this:
//
// C:\...\Swift\Toolchains\6.0.0+Asserts\usr\lib\swift
//
// The runtimes are in
//
// C:\...\Swift\Runtimes\6.0.0\usr\bin
//
llvm::SmallString<128> RuntimePath(LibPath);
llvm::sys::path::remove_filename(RuntimePath);
llvm::sys::path::remove_filename(RuntimePath);
llvm::sys::path::remove_filename(RuntimePath);
llvm::SmallString<128> VersionWithAttrs(llvm::sys::path::filename(RuntimePath));
size_t MaybePlus = VersionWithAttrs.find_first_of('+');
StringRef Version = VersionWithAttrs.substr(0, MaybePlus);
llvm::sys::path::remove_filename(RuntimePath);
llvm::sys::path::remove_filename(RuntimePath);
llvm::sys::path::append(RuntimePath, "Runtimes", Version, "usr", "bin");
SearchPathOpts.RuntimeLibraryPaths.push_back(std::string(RuntimePath.str()));
#endif
llvm::sys::path::append(LibPath, LibSubDir);
SearchPathOpts.RuntimeLibraryPaths.push_back(std::string(LibPath.str()));
if (Triple.isOSDarwin())
SearchPathOpts.RuntimeLibraryPaths.push_back(DARWIN_OS_LIBRARY_PATH);
// If this is set, we don't want any runtime import paths.
if (SearchPathOpts.SkipRuntimeLibraryImportPaths) {
SearchPathOpts.setRuntimeLibraryImportPaths({});
return;
}
// Set up the import paths containing the swiftmodules for the libraries in
// RuntimeLibraryPath.
std::vector<std::string> RuntimeLibraryImportPaths;
RuntimeLibraryImportPaths.push_back(std::string(LibPath.str()));
// This is compatibility for <=5.3
if (!Triple.isOSDarwin()) {
llvm::sys::path::append(LibPath, swift::getMajorArchitectureName(Triple));
RuntimeLibraryImportPaths.push_back(std::string(LibPath.str()));
}
if (!SearchPathOpts.ExcludeSDKPathsFromRuntimeLibraryImportPaths && !SearchPathOpts.getSDKPath().empty()) {
const char *swiftDir = FrontendOpts.UseSharedResourceFolder
? "swift" : "swift_static";
if (tripleIsMacCatalystEnvironment(Triple)) {
LibPath = SearchPathOpts.getSDKPath();
llvm::sys::path::append(LibPath, "System", "iOSSupport");
llvm::sys::path::append(LibPath, "usr", "lib", swiftDir);
RuntimeLibraryImportPaths.push_back(std::string(LibPath.str()));
}
LibPath = SearchPathOpts.getSDKPath();
llvm::sys::path::append(LibPath, "usr", "lib", swiftDir);
if (!Triple.isOSDarwin()) {
// Use the non-architecture suffixed form with directory-layout
// swiftmodules.
llvm::sys::path::append(LibPath, getPlatformNameForTriple(Triple));
RuntimeLibraryImportPaths.push_back(std::string(LibPath.str()));
// Compatibility with older releases - use the architecture suffixed form
// for pre-directory-layout multi-architecture layout. Note that some
// platforms (e.g. Windows) will use this even with directory layout in
// older releases.
llvm::sys::path::append(LibPath, swift::getMajorArchitectureName(Triple));
}
RuntimeLibraryImportPaths.push_back(std::string(LibPath.str()));
}
SearchPathOpts.setRuntimeLibraryImportPaths(RuntimeLibraryImportPaths);
}
static void
setIRGenOutputOptsFromFrontendOptions(IRGenOptions &IRGenOpts,
const FrontendOptions &FrontendOpts) {
// Set the OutputKind for the given Action.
IRGenOpts.OutputKind = [](FrontendOptions::ActionType Action) {
switch (Action) {
case FrontendOptions::ActionType::EmitIRGen:
return IRGenOutputKind::LLVMAssemblyBeforeOptimization;
case FrontendOptions::ActionType::EmitIR:
return IRGenOutputKind::LLVMAssemblyAfterOptimization;
case FrontendOptions::ActionType::EmitBC:
return IRGenOutputKind::LLVMBitcode;
case FrontendOptions::ActionType::EmitAssembly:
return IRGenOutputKind::NativeAssembly;
case FrontendOptions::ActionType::Immediate:
return IRGenOutputKind::Module;
case FrontendOptions::ActionType::EmitObject:
default:
// Just fall back to emitting an object file. If we aren't going to run
// IRGen, it doesn't really matter what we put here anyways.
return IRGenOutputKind::ObjectFile;
}
}(FrontendOpts.RequestedAction);
// If we're in JIT mode, set the requisite flags.
if (FrontendOpts.RequestedAction == FrontendOptions::ActionType::Immediate) {
IRGenOpts.UseJIT = true;
IRGenOpts.DebugInfoLevel = IRGenDebugInfoLevel::Normal;
IRGenOpts.DebugInfoFormat = IRGenDebugInfoFormat::DWARF;
}
}
static void
setBridgingHeaderFromFrontendOptions(ClangImporterOptions &ImporterOpts,
const FrontendOptions &FrontendOpts) {
if (FrontendOpts.RequestedAction != FrontendOptions::ActionType::EmitPCH)
return;
// If there aren't any inputs, there's nothing to do.
if (!FrontendOpts.InputsAndOutputs.hasInputs())
return;
// If we aren't asked to output a bridging header, we don't need to set this.
if (ImporterOpts.PrecompiledHeaderOutputDir.empty())
return;
ImporterOpts.BridgingHeader =
FrontendOpts.InputsAndOutputs.getFilenameOfFirstInput();
}
void CompilerInvocation::computeCXXStdlibOptions() {
// The MSVC driver in Clang is not aware of the C++ stdlib, and currently
// always assumes libstdc++, which is incorrect: the Microsoft stdlib is
// normally used.
if (LangOpts.Target.isOSWindows()) {
// In the future, we should support libc++ on Windows. That would require
// the MSVC driver to support it first
// (see https://reviews.llvm.org/D101479).
LangOpts.CXXStdlib = CXXStdlibKind::Msvcprt;
LangOpts.PlatformDefaultCXXStdlib = CXXStdlibKind::Msvcprt;
} else if (LangOpts.Target.isOSLinux() || LangOpts.Target.isOSDarwin()) {
auto [clangDriver, clangDiagEngine] =
ClangImporter::createClangDriver(LangOpts, ClangImporterOpts);
auto clangDriverArgs = ClangImporter::createClangArgs(
ClangImporterOpts, SearchPathOpts, clangDriver);
auto &clangToolchain =
clangDriver.getToolChain(clangDriverArgs, LangOpts.Target);
auto cxxStdlibKind = clangToolchain.GetCXXStdlibType(clangDriverArgs);
auto cxxDefaultStdlibKind = clangToolchain.GetDefaultCXXStdlibType();
auto toCXXStdlibKind =
[](clang::driver::ToolChain::CXXStdlibType clangCXXStdlibType)
-> CXXStdlibKind {
switch (clangCXXStdlibType) {
case clang::driver::ToolChain::CST_Libcxx:
return CXXStdlibKind::Libcxx;
case clang::driver::ToolChain::CST_Libstdcxx:
return CXXStdlibKind::Libstdcxx;
}
};
LangOpts.CXXStdlib = toCXXStdlibKind(cxxStdlibKind);
LangOpts.PlatformDefaultCXXStdlib = toCXXStdlibKind(cxxDefaultStdlibKind);
}
if (!LangOpts.isUsingPlatformDefaultCXXStdlib()) {
// The CxxStdlib overlay was built for the platform default C++ stdlib, and
// its .swiftmodule file refers to implementation-specific symbols (such as
// namespace __1 in libc++, or namespace __cxx11 in libstdc++). Let's
// proactively rebuild the CxxStdlib module from its .swiftinterface if a
// non-default C++ stdlib is used.
FrontendOpts.PreferInterfaceForModules.push_back("CxxStdlib");
}
}
void CompilerInvocation::setRuntimeResourcePath(StringRef Path) {
SearchPathOpts.RuntimeResourcePath = Path.str();
updateRuntimeLibraryPaths(SearchPathOpts, FrontendOpts, LangOpts);
}
void CompilerInvocation::setPlatformAvailabilityInheritanceMapPath(StringRef Path) {
SearchPathOpts.PlatformAvailabilityInheritanceMapPath = Path.str();
}
void CompilerInvocation::setTargetTriple(StringRef Triple) {
setTargetTriple(llvm::Triple(Triple));
}
void CompilerInvocation::setTargetTriple(const llvm::Triple &Triple) {
LangOpts.setTarget(Triple);
updateRuntimeLibraryPaths(SearchPathOpts, FrontendOpts, LangOpts);
}
void CompilerInvocation::setSDKPath(const std::string &Path) {
SearchPathOpts.setSDKPath(Path);
updateRuntimeLibraryPaths(SearchPathOpts, FrontendOpts, LangOpts);
}
bool CompilerInvocation::setModuleAliasMap(std::vector<std::string> args,
DiagnosticEngine &diags) {
return ModuleAliasesConverter::computeModuleAliases(args, FrontendOpts, diags);
}
static void ParseAssertionArgs(ArgList &args) {
using namespace options;
if (args.hasArg(OPT_compiler_assertions)) {
CONDITIONAL_ASSERT_Global_enable_flag = 1;
}
}
static bool ParseFrontendArgs(
FrontendOptions &opts, ArgList &args, DiagnosticEngine &diags,
SmallVectorImpl<std::unique_ptr<llvm::MemoryBuffer>> *buffers) {
ArgsToFrontendOptionsConverter converter(diags, args, opts);
return converter.convert(buffers);
}
static void diagnoseSwiftVersion(std::optional<version::Version> &vers,
Arg *verArg, ArgList &Args,
DiagnosticEngine &diags) {
// General invalid version error
diags.diagnose(SourceLoc(), diag::error_invalid_arg_value,
verArg->getAsString(Args), verArg->getValue());
// Note valid versions.
auto validVers = version::Version::getValidEffectiveVersions();
auto versStr = "'" + llvm::join(validVers, "', '") + "'";
diags.diagnose(SourceLoc(), diag::note_valid_swift_versions, versStr);
}
/// Create a new Regex instance out of the string value in \p RpassArg.
/// It returns a pointer to the newly generated Regex instance.
static std::shared_ptr<llvm::Regex>
generateOptimizationRemarkRegex(DiagnosticEngine &Diags, ArgList &Args,
Arg *RpassArg) {
StringRef Val = RpassArg->getValue();
std::string RegexError;
std::shared_ptr<llvm::Regex> Pattern = std::make_shared<llvm::Regex>(Val);
if (!Pattern->isValid(RegexError)) {
Diags.diagnose(SourceLoc(), diag::error_optimization_remark_pattern,
RegexError, RpassArg->getAsString(Args));
Pattern.reset();
}
return Pattern;
}
// Lifted from the clang driver.
static void PrintArg(raw_ostream &OS, const char *Arg, StringRef TempDir) {
const bool Escape = std::strpbrk(Arg, "\"\\$ ");
if (!TempDir.empty()) {
llvm::SmallString<256> ArgPath{Arg};
llvm::sys::fs::make_absolute(ArgPath);
llvm::sys::path::native(ArgPath);
llvm::SmallString<256> TempPath{TempDir};
llvm::sys::fs::make_absolute(TempPath);
llvm::sys::path::native(TempPath);
if (StringRef(ArgPath).starts_with(TempPath)) {
// Don't write temporary file names in the debug info. This would prevent
// incremental llvm compilation because we would generate different IR on
// every compiler invocation.
Arg = "<temporary-file>";
}
}
if (!Escape) {
OS << Arg;
return;
}
// Quote and escape. This isn't really complete, but good enough.
OS << '"';
while (const char c = *Arg++) {
if (c == '"' || c == '\\' || c == '$')
OS << '\\';
OS << c;
}
OS << '"';
}
static void ParseModuleInterfaceArgs(ModuleInterfaceOptions &Opts,
ArgList &Args) {
using namespace options;
Opts.PreserveTypesAsWritten |=
Args.hasArg(OPT_module_interface_preserve_types_as_written);
Opts.AliasModuleNames |=
Args.hasFlag(OPT_alias_module_names_in_module_interface,
OPT_disable_alias_module_names_in_module_interface,
::getenv("SWIFT_ALIAS_MODULE_NAMES_IN_INTERFACES"));
Opts.PrintFullConvention |=
Args.hasArg(OPT_experimental_print_full_convention);
Opts.DebugPrintInvalidSyntax |=
Args.hasArg(OPT_debug_emit_invalid_swiftinterface_syntax);
Opts.PrintMissingImports =
!Args.hasArg(OPT_disable_print_missing_imports_in_module_interface);
if (const Arg *A = Args.getLastArg(OPT_library_level)) {
StringRef contents = A->getValue();
if (contents == "spi") {
Opts.setInterfaceMode(PrintOptions::InterfaceMode::Private);
}
}
}
/// Checks if an arg is generally allowed to be included
/// in a module interface
static bool ShouldIncludeModuleInterfaceArg(const Arg *A) {
if (!A->getOption().hasFlag(options::ModuleInterfaceOption) &&
!A->getOption().hasFlag(options::ModuleInterfaceOptionIgnorable))
return false;
if (!A->getOption().matches(options::OPT_enable_experimental_feature))
return true;
if (auto feature = getExperimentalFeature(A->getValue())) {
return swift::includeInModuleInterface(*feature);
}
return true;
}
static bool IsPackageInterfaceFlag(const Arg *A, ArgList &Args) {
return false;
}
static bool IsPrivateInterfaceFlag(const Arg *A, ArgList &Args) {
return A->getOption().matches(options::OPT_project_name);
}
/// Save a copy of any flags marked as ModuleInterfaceOption, if running
/// in a mode that is going to emit a .swiftinterface file.
static void SaveModuleInterfaceArgs(ModuleInterfaceOptions &Opts,
FrontendOptions &FOpts,
ArgList &Args, DiagnosticEngine &Diags) {
if (!FOpts.InputsAndOutputs.hasModuleInterfaceOutputPath())
return;
struct RenderedInterfaceArgs {
ArgStringList Standard = {};
ArgStringList Ignorable = {};
};
RenderedInterfaceArgs PublicArgs{};
RenderedInterfaceArgs PrivateArgs{};
RenderedInterfaceArgs PackageArgs{};
auto interfaceArgListForArg = [&](Arg *A) -> ArgStringList & {
bool ignorable =
A->getOption().hasFlag(options::ModuleInterfaceOptionIgnorable);
if (IsPackageInterfaceFlag(A, Args))
return ignorable ? PackageArgs.Ignorable : PackageArgs.Standard;
if (IsPrivateInterfaceFlag(A, Args))
return ignorable ? PrivateArgs.Ignorable : PrivateArgs.Standard;
return ignorable ? PublicArgs.Ignorable : PublicArgs.Standard;
};
for (auto A : Args) {
if (!ShouldIncludeModuleInterfaceArg(A))
continue;
ArgStringList &ArgList = interfaceArgListForArg(A);
A->render(Args, ArgList);
}
auto updateInterfaceOpts = [](ModuleInterfaceOptions::InterfaceFlags &Flags,
RenderedInterfaceArgs &RenderedArgs) {
auto printFlags = [](std::string &str, ArgStringList argList) {
llvm::raw_string_ostream OS(str);
interleave(
argList,
[&](const char *Argument) { PrintArg(OS, Argument, StringRef()); },
[&] { OS << " "; });
};
printFlags(Flags.Flags, RenderedArgs.Standard);
printFlags(Flags.IgnorableFlags, RenderedArgs.Ignorable);
};
updateInterfaceOpts(Opts.PublicFlags, PublicArgs);
updateInterfaceOpts(Opts.PrivateFlags, PrivateArgs);
updateInterfaceOpts(Opts.PackageFlags, PackageArgs);
}
enum class CxxCompatMode {
invalid,
enabled,
off
};
static std::pair<CxxCompatMode, version::Version>
validateCxxInteropCompatibilityMode(StringRef mode) {
if (mode == "off")
return {CxxCompatMode::off, {}};
if (mode == "default")
return {CxxCompatMode::enabled, {}};
if (mode == "upcoming-swift")
return {CxxCompatMode::enabled,
version::Version({version::getUpcomingCxxInteropCompatVersion()})};
if (mode == "swift-6")
return {CxxCompatMode::enabled, version::Version({6})};
// Swift-5.9 corresponds to the Swift 5 language mode when
// Swift 5 is the default language version.
if (mode == "swift-5.9")
return {CxxCompatMode::enabled, version::Version({5})};
// Note: If this is updated, corresponding code in
// InterfaceSubContextDelegateImpl::InterfaceSubContextDelegateImpl needs
// to be updated also.
return {CxxCompatMode::invalid, {}};
}
static void diagnoseCxxInteropCompatMode(Arg *verArg, ArgList &Args,
DiagnosticEngine &diags) {
// General invalid argument error
diags.diagnose(SourceLoc(), diag::error_invalid_arg_value,
verArg->getAsString(Args), verArg->getValue());
// Note valid C++ interoperability modes.
auto validVers = {llvm::StringRef("off"), llvm::StringRef("default"),
llvm::StringRef("swift-6"), llvm::StringRef("swift-5.9")};
auto versStr = "'" + llvm::join(validVers, "', '") + "'";
diags.diagnose(SourceLoc(), diag::valid_cxx_interop_modes,
verArg->getSpelling(), versStr);
}
void LangOptions::setCxxInteropFromArgs(ArgList &Args,
swift::DiagnosticEngine &Diags) {
if (Arg *A = Args.getLastArg(options::OPT_cxx_interoperability_mode)) {
if (Args.hasArg(options::OPT_enable_experimental_cxx_interop)) {
Diags.diagnose(SourceLoc(), diag::dont_enable_interop_and_compat);
}
auto interopCompatMode = validateCxxInteropCompatibilityMode(A->getValue());
EnableCXXInterop |=
(interopCompatMode.first == CxxCompatMode::enabled);
if (EnableCXXInterop) {
cxxInteropCompatVersion = interopCompatMode.second;
// The default is tied to the current language version.
if (cxxInteropCompatVersion.empty())
cxxInteropCompatVersion =
EffectiveLanguageVersion.asMajorVersion();
}
if (interopCompatMode.first == CxxCompatMode::invalid)
diagnoseCxxInteropCompatMode(A, Args, Diags);
}
if (Args.hasArg(options::OPT_enable_experimental_cxx_interop)) {
Diags.diagnose(SourceLoc(), diag::enable_interop_flag_deprecated);
Diags.diagnose(SourceLoc(), diag::swift_will_maintain_compat);
EnableCXXInterop |= true;
// Using the deprecated option only forces the 'swift-5.9' compat
// mode.
if (cxxInteropCompatVersion.empty())
cxxInteropCompatVersion =
validateCxxInteropCompatibilityMode("swift-5.9").second;
}
if (Arg *A = Args.getLastArg(options::OPT_formal_cxx_interoperability_mode)) {
// Take formal version from explicitly specified formal version flag
StringRef version = A->getValue();
// FIXME: the only valid modes are 'off' and 'swift-6'; see below.
if (version == "off") {
FormalCxxInteropMode = std::nullopt;
} else if (version == "swift-6") {
FormalCxxInteropMode = {6};
} else {
Diags.diagnose(SourceLoc(), diag::error_invalid_arg_value,
A->getAsString(Args), A->getValue());
Diags.diagnose(SourceLoc(), diag::valid_cxx_interop_modes,
A->getSpelling(), "'off', 'swift-6'");
}
} else {
// In the absence of a formal mode flag, we capture it from the current
// C++ compat version (if C++ interop is enabled).
//
// FIXME: cxxInteropCompatVersion is computed based on the Swift language
// version, and is either 4, 5, 6, or 7 (even though only 5.9 and 6.* make
// any sense). For now, we don't actually care about the version, so we'll
// just use version 6 (i.e., 'swift-6') to mean that C++ interop mode is on.
if (EnableCXXInterop)
FormalCxxInteropMode = {6};
else
FormalCxxInteropMode = std::nullopt;
}
}
static std::string printFormalCxxInteropVersion(const LangOptions &Opts) {
std::string str;
llvm::raw_string_ostream OS(str);
OS << "-formal-cxx-interoperability-mode=";
// We must print a 'stable' C++ interop version here, which cannot be
// 'default' and 'upcoming-swift' (since those are relative to the current
// version, which may change in the future).
if (!Opts.FormalCxxInteropMode) {
OS << "off";
} else {
// FIXME: FormalCxxInteropMode will always be 6 (or nullopt); see above
OS << "swift-6";
}
return str;
}
static std::optional<swift::StrictConcurrency>
parseStrictConcurrency(StringRef value) {
return llvm::StringSwitch<std::optional<swift::StrictConcurrency>>(value)
.Case("minimal", swift::StrictConcurrency::Minimal)
.Case("targeted", swift::StrictConcurrency::Targeted)
.Case("complete", swift::StrictConcurrency::Complete)
.Default(std::nullopt);
}
static bool ParseCASArgs(CASOptions &Opts, ArgList &Args,
DiagnosticEngine &Diags,
const FrontendOptions &FrontendOpts) {
using namespace options;
Opts.EnableCaching |= Args.hasArg(OPT_cache_compile_job);
Opts.EnableCachingRemarks |= Args.hasArg(OPT_cache_remarks);
Opts.CacheSkipReplay |= Args.hasArg(OPT_cache_disable_replay);
if (const Arg *A = Args.getLastArg(OPT_cas_path))
Opts.CASOpts.CASPath = A->getValue();
else if (Opts.CASOpts.CASPath.empty())
Opts.CASOpts.CASPath = llvm::cas::getDefaultOnDiskCASPath();
if (const Arg *A = Args.getLastArg(OPT_cas_plugin_path))
Opts.CASOpts.PluginPath = A->getValue();
for (StringRef Opt : Args.getAllArgValues(OPT_cas_plugin_option)) {
StringRef Name, Value;
std::tie(Name, Value) = Opt.split('=');
Opts.CASOpts.PluginOptions.emplace_back(std::string(Name),
std::string(Value));
}
for (const auto &A : Args.getAllArgValues(OPT_cas_fs))
Opts.CASFSRootIDs.emplace_back(A);
for (const auto &A : Args.getAllArgValues(OPT_clang_include_tree_root))
Opts.ClangIncludeTrees.emplace_back(A);
for (const auto &A : Args.getAllArgValues(OPT_clang_include_tree_filelist))
Opts.ClangIncludeTreeFileList.emplace_back(A);
if (const Arg *A = Args.getLastArg(OPT_input_file_key))
Opts.InputFileKey = A->getValue();
if (const Arg*A = Args.getLastArg(OPT_bridging_header_pch_key))
Opts.BridgingHeaderPCHCacheKey = A->getValue();
if (!Opts.CASFSRootIDs.empty() || !Opts.ClangIncludeTrees.empty() ||
!Opts.ClangIncludeTreeFileList.empty())
Opts.HasImmutableFileSystem = true;
return false;
}
static bool ParseEnabledFeatureArgs(LangOptions &Opts, ArgList &Args,
DiagnosticEngine &Diags,
const FrontendOptions &FrontendOpts) {
using namespace options;
bool HadError = false;
// Enable feature upcoming/experimental features if requested. However, leave
// a feature disabled if an -enable-upcoming-feature flag is superseded by a
// -disable-upcoming-feature flag. Since only the last flag specified is
// honored, we iterate over them in reverse order.
std::vector<StringRef> psuedoFeatures;
llvm::SmallSet<Feature, 8> seenFeatures;
for (const Arg *A : Args.filtered_reverse(
OPT_enable_experimental_feature, OPT_disable_experimental_feature,
OPT_enable_upcoming_feature, OPT_disable_upcoming_feature)) {
auto &option = A->getOption();
const StringRef argValue = A->getValue();
bool isEnableUpcomingFeatureFlag =
option.matches(OPT_enable_upcoming_feature);
bool isUpcomingFeatureFlag = isEnableUpcomingFeatureFlag ||
option.matches(OPT_disable_upcoming_feature);
bool isEnableFeatureFlag = isEnableUpcomingFeatureFlag ||
option.matches(OPT_enable_experimental_feature);
// Collect some special case pseudo-features which should be processed
// separately.
if (argValue.starts_with("StrictConcurrency") ||
argValue.starts_with("AvailabilityMacro=")) {
if (isEnableFeatureFlag)
psuedoFeatures.push_back(argValue);
continue;
}
// For all other features, the argument format is `<name>[:adoption]`.
StringRef featureName;
std::optional<StringRef> featureMode;
std::tie(featureName, featureMode) = argValue.rsplit(':');
if (featureMode.value().empty()) {
featureMode = std::nullopt;
}
auto feature = getUpcomingFeature(featureName);
if (feature) {
// Diagnose upcoming features enabled with -enable-experimental-feature.
if (!isUpcomingFeatureFlag)
Diags.diagnose(SourceLoc(), diag::feature_not_experimental, featureName,
isEnableFeatureFlag);
} else {
// If -enable-upcoming-feature was used and an upcoming feature was not
// found, diagnose and continue.
if (isUpcomingFeatureFlag) {
Diags.diagnose(SourceLoc(), diag::unrecognized_feature, featureName,
/*upcoming=*/true);
continue;
}
// If the feature is also not a recognized experimental feature, skip it.
feature = getExperimentalFeature(featureName);
if (!feature) {
Diags.diagnose(SourceLoc(), diag::unrecognized_feature, featureName,
/*upcoming=*/false);
continue;
}
}
// If the current language mode enables the feature by default then
// diagnose and skip it.
if (auto firstVersion = getFeatureLanguageVersion(*feature)) {
if (Opts.isSwiftVersionAtLeast(*firstVersion)) {
Diags.diagnose(SourceLoc(),
diag::warning_upcoming_feature_on_by_default,
getFeatureName(*feature), *firstVersion);
continue;
}
}
// If this is a known experimental feature, allow it in +Asserts
// (non-release) builds for testing purposes.
if (Opts.RestrictNonProductionExperimentalFeatures &&
!isFeatureAvailableInProduction(*feature)) {
Diags.diagnose(SourceLoc(),
diag::experimental_not_supported_in_production,
featureName);
HadError = true;
continue;
}
if (featureMode) {
if (isEnableFeatureFlag) {
const auto isAdoptable = isFeatureAdoptable(*feature);
// Diagnose an invalid mode.
StringRef validModeName = "adoption";
if (*featureMode != validModeName) {
Diags.diagnose(SourceLoc(), diag::invalid_feature_mode, *featureMode,
featureName,
/*didYouMean=*/validModeName,
/*showDidYouMean=*/isAdoptable);
continue;
}
if (!isAdoptable) {
Diags.diagnose(SourceLoc(),
diag::feature_does_not_support_adoption_mode,
featureName);
continue;
}
} else {
// `-disable-*-feature` flags do not support a mode specifier.
Diags.diagnose(SourceLoc(), diag::cannot_disable_feature_with_mode,
option.getPrefixedName(), argValue);
continue;
}
}
// Skip features that are already enabled or disabled.
if (!seenFeatures.insert(*feature).second)
continue;
// Enable the feature if requested.
if (isEnableFeatureFlag)
Opts.enableFeature(*feature, /*forAdoption=*/featureMode.has_value());
}
// Since pseudo-features don't have a boolean on/off state, process them in
// the order they were specified on the command line.
for (auto featureName = psuedoFeatures.rbegin(), end = psuedoFeatures.rend();
featureName != end; ++featureName) {
// Allow StrictConcurrency to have a value that corresponds to the
// -strict-concurrency=<blah> settings.
if (featureName->starts_with("StrictConcurrency")) {
auto decomposed = featureName->split("=");
if (decomposed.first == "StrictConcurrency") {
if (decomposed.second == "") {
Opts.StrictConcurrencyLevel = StrictConcurrency::Complete;
} else if (auto level = parseStrictConcurrency(decomposed.second)) {
Opts.StrictConcurrencyLevel = *level;
}
}
continue;
}
// Hack: In order to support using availability macros in SPM packages, we
// need to be able to use:
// .enableExperimentalFeature("AvailabilityMacro='...'")
// within the package manifest and the feature recognizer can't recognize
// this form of feature, so specially handle it here until features can
// maybe have extra arguments in the future.
if (featureName->starts_with("AvailabilityMacro=")) {
auto availability = featureName->split("=").second;
Opts.AvailabilityMacros.push_back(availability.str());
continue;
}
}
// Map historical flags over to experimental features. We do this for all
// compilers because that's how existing experimental feature flags work.
if (Args.hasArg(OPT_enable_experimental_static_assert))
Opts.enableFeature(Feature::StaticAssert);
if (Args.hasArg(OPT_enable_experimental_named_opaque_types))
Opts.enableFeature(Feature::NamedOpaqueTypes);
if (Args.hasArg(OPT_enable_experimental_flow_sensitive_concurrent_captures))
Opts.enableFeature(Feature::FlowSensitiveConcurrencyCaptures);
if (Args.hasArg(OPT_enable_experimental_move_only)) {
// FIXME: drop addition of Feature::MoveOnly once its queries are gone.
Opts.enableFeature(Feature::MoveOnly);
Opts.enableFeature(Feature::NoImplicitCopy);
Opts.enableFeature(Feature::OldOwnershipOperatorSpellings);
}
if (Args.hasArg(OPT_enable_experimental_forward_mode_differentiation))
Opts.enableFeature(Feature::ForwardModeDifferentiation);
if (Args.hasArg(OPT_enable_experimental_additive_arithmetic_derivation))
Opts.enableFeature(Feature::AdditiveArithmeticDerivedConformances);
if (Args.hasArg(OPT_enable_experimental_opaque_type_erasure))
Opts.enableFeature(Feature::OpaqueTypeErasure);
if (Args.hasArg(OPT_enable_builtin_module))
Opts.enableFeature(Feature::BuiltinModule);
Opts.enableFeature(Feature::LayoutPrespecialization);
if (Args.hasArg(OPT_strict_memory_safety))
Opts.enableFeature(Feature::StrictMemorySafety);
return HadError;
}
static bool ParseLangArgs(LangOptions &Opts, ArgList &Args,
DiagnosticEngine &Diags,
ModuleInterfaceOptions &ModuleInterfaceOpts,
const FrontendOptions &FrontendOpts) {
using namespace options;
bool buildingFromInterface =
FrontendOptions::doesActionBuildModuleFromInterface(
FrontendOpts.RequestedAction);
bool HadError = false;
if (auto A = Args.getLastArg(OPT_swift_version)) {
auto vers =
VersionParser::parseVersionString(A->getValue(), SourceLoc(), &Diags);
bool isValid = false;
if (vers.has_value()) {
if (auto effectiveVers = vers.value().getEffectiveLanguageVersion()) {
Opts.EffectiveLanguageVersion = effectiveVers.value();
isValid = true;
}
}
if (!isValid)
diagnoseSwiftVersion(vers, A, Args, Diags);
}
if (auto A = Args.getLastArg(OPT_package_description_version)) {
auto vers =