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SerializedModuleLoader.cpp
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//===--- SerializedModuleLoader.cpp - Import Swift modules ----------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 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 "swift/Serialization/SerializedModuleLoader.h"
#include "ModuleFile.h"
#include "ModuleFileSharedCore.h"
#include "swift/AST/ASTContext.h"
#include "swift/AST/DiagnosticsSema.h"
#include "swift/AST/ImportCache.h"
#include "swift/AST/Module.h"
#include "swift/AST/ModuleDependencies.h"
#include "swift/AST/PluginLoader.h"
#include "swift/Basic/Assertions.h"
#include "swift/Basic/Defer.h"
#include "swift/Basic/FileTypes.h"
#include "swift/Basic/Platform.h"
#include "swift/Basic/STLExtras.h"
#include "swift/Basic/SourceManager.h"
#include "swift/Basic/Version.h"
#include "swift/Frontend/ModuleInterfaceLoader.h"
#include "swift/Option/Options.h"
#include "swift/Serialization/Validation.h"
#include "llvm/Option/OptTable.h"
#include "llvm/Option/ArgList.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringSet.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/VersionTuple.h"
#include "llvm/TargetParser/Host.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/CommandLine.h"
#include <memory>
#include <optional>
#include <system_error>
using namespace swift;
using swift::version::Version;
namespace {
/// Apply \c body for each target-specific module file base name to search from
/// most to least desirable.
void forEachTargetModuleBasename(const ASTContext &Ctx,
llvm::function_ref<void(StringRef)> body) {
auto normalizedTarget = getTargetSpecificModuleTriple(Ctx.LangOpts.Target);
// An arm64 module can import an arm64e module.
std::optional<llvm::Triple> normalizedAltTarget;
if ((normalizedTarget.getArch() == llvm::Triple::ArchType::aarch64) &&
(normalizedTarget.getSubArch() !=
llvm::Triple::SubArchType::AArch64SubArch_arm64e)) {
auto altTarget = normalizedTarget;
altTarget.setArchName("arm64e");
normalizedAltTarget = getTargetSpecificModuleTriple(altTarget);
}
body(normalizedTarget.str());
if (normalizedAltTarget) {
body(normalizedAltTarget->str());
}
// We used the un-normalized architecture as a target-specific
// module name. Fall back to that behavior.
body(Ctx.LangOpts.Target.getArchName());
// FIXME: We used to use "major architecture" names for these files---the
// names checked in "#if arch(...)". Fall back to that name in the one case
// where it's different from what Swift 4.2 supported:
// - 32-bit ARM platforms (formerly "arm")
// We should be able to drop this once there's an Xcode that supports the
// new names.
if (Ctx.LangOpts.Target.getArch() == llvm::Triple::ArchType::arm) {
body("arm");
}
if (normalizedAltTarget) {
body(normalizedAltTarget->getArchName());
}
}
/// Apply \p body for each module search path in \p Ctx until \p body returns
/// non-None value. Returns the return value from \p body, or \c None.
std::optional<bool> forEachModuleSearchPath(
const ASTContext &Ctx,
llvm::function_ref<std::optional<bool>(StringRef, ModuleSearchPathKind,
bool isSystem)>
callback) {
for (const auto &path : Ctx.SearchPathOpts.getImportSearchPaths())
if (auto result =
callback(path.Path, ModuleSearchPathKind::Import, path.IsSystem))
return result;
for (const auto &path : Ctx.SearchPathOpts.getFrameworkSearchPaths())
if (auto result =
callback(path.Path, ModuleSearchPathKind::Framework, path.IsSystem))
return result;
// Apple platforms have extra implicit framework search paths:
// $SDKROOT/System/Library/Frameworks/ and $SDKROOT/Library/Frameworks/.
if (Ctx.LangOpts.Target.isOSDarwin()) {
for (const auto &path : Ctx.getDarwinImplicitFrameworkSearchPaths())
if (auto result =
callback(path, ModuleSearchPathKind::DarwinImplicitFramework,
/*isSystem=*/true))
return result;
}
for (const auto &importPath :
Ctx.SearchPathOpts.getRuntimeLibraryImportPaths()) {
if (auto result = callback(importPath, ModuleSearchPathKind::RuntimeLibrary,
/*isSystem=*/true))
return result;
}
return std::nullopt;
}
} // end unnamed namespace
// Defined out-of-line so that we can see ~ModuleFile.
SerializedModuleLoaderBase::SerializedModuleLoaderBase(
ASTContext &ctx, DependencyTracker *tracker, ModuleLoadingMode loadMode,
bool IgnoreSwiftSourceInfoFile)
: ModuleLoader(tracker), Ctx(ctx), LoadMode(loadMode),
IgnoreSwiftSourceInfoFile(IgnoreSwiftSourceInfoFile) {}
SerializedModuleLoaderBase::~SerializedModuleLoaderBase() = default;
ImplicitSerializedModuleLoader::~ImplicitSerializedModuleLoader() = default;
MemoryBufferSerializedModuleLoader::~MemoryBufferSerializedModuleLoader() =
default;
void SerializedModuleLoaderBase::collectVisibleTopLevelModuleNamesImpl(
SmallVectorImpl<Identifier> &names, StringRef extension) const {
llvm::SmallString<16> moduleSuffix;
moduleSuffix += '.';
moduleSuffix += file_types::getExtension(file_types::TY_SwiftModuleFile);
llvm::SmallString<16> suffix;
suffix += '.';
suffix += extension;
SmallVector<SmallString<64>, 2> targetFiles;
forEachTargetModuleBasename(Ctx, [&](StringRef targetName) {
targetFiles.emplace_back(targetName);
targetFiles.back() += suffix;
});
auto &fs = *Ctx.SourceMgr.getFileSystem();
// Apply \p body for each directory entry in \p dirPath.
auto forEachDirectoryEntryPath =
[&](StringRef dirPath, llvm::function_ref<void(StringRef)> body) {
std::error_code errorCode;
llvm::vfs::directory_iterator DI = fs.dir_begin(dirPath, errorCode);
llvm::vfs::directory_iterator End;
for (; !errorCode && DI != End; DI.increment(errorCode))
body(DI->path());
};
// Check whether target specific module file exists or not in given directory.
// $PATH/{arch}.{extension}
auto checkTargetFiles = [&](StringRef path) -> bool {
llvm::SmallString<256> scratch;
for (auto targetFile : targetFiles) {
scratch.clear();
llvm::sys::path::append(scratch, path, targetFile);
// If {arch}.{extension} exists, consider it's visible. Technically, we
// should check the file type, permission, format, etc., but it's too
// heavy to do that for each files.
if (fs.exists(scratch))
return true;
}
return false;
};
forEachModuleSearchPath(Ctx, [&](StringRef searchPath,
ModuleSearchPathKind Kind, bool isSystem) {
switch (Kind) {
case ModuleSearchPathKind::Import: {
// Look for:
// $PATH/{name}.swiftmodule/{arch}.{extension} or
// $PATH/{name}.{extension}
forEachDirectoryEntryPath(searchPath, [&](StringRef path) {
auto pathExt = llvm::sys::path::extension(path);
if (pathExt != moduleSuffix && pathExt != suffix)
return;
auto stat = fs.status(path);
if (!stat)
return;
if (pathExt == moduleSuffix && stat->isDirectory()) {
if (!checkTargetFiles(path))
return;
} else if (pathExt != suffix || stat->isDirectory()) {
return;
}
// Extract module name.
auto name = llvm::sys::path::filename(path).drop_back(pathExt.size());
names.push_back(Ctx.getIdentifier(name));
});
return std::nullopt;
}
case ModuleSearchPathKind::RuntimeLibrary: {
// Look for:
// (Darwin OS) $PATH/{name}.swiftmodule/{arch}.{extension}
// (Other OS) $PATH/{name}.{extension}
bool requireTargetSpecificModule = Ctx.LangOpts.Target.isOSDarwin();
forEachDirectoryEntryPath(searchPath, [&](StringRef path) {
auto pathExt = llvm::sys::path::extension(path);
if (pathExt != moduleSuffix)
if (requireTargetSpecificModule || pathExt != suffix)
return;
if (!checkTargetFiles(path)) {
if (requireTargetSpecificModule)
return;
auto stat = fs.status(path);
if (!stat || stat->isDirectory())
return;
}
// Extract module name.
auto name = llvm::sys::path::filename(path).drop_back(pathExt.size());
names.push_back(Ctx.getIdentifier(name));
});
return std::nullopt;
}
case ModuleSearchPathKind::Framework:
case ModuleSearchPathKind::DarwinImplicitFramework: {
// Look for:
// $PATH/{name}.framework/Modules/{name}.swiftmodule/{arch}.{extension}
forEachDirectoryEntryPath(searchPath, [&](StringRef path) {
if (llvm::sys::path::extension(path) != ".framework")
return;
// Extract Framework name.
auto name = llvm::sys::path::filename(path).drop_back(
StringLiteral(".framework").size());
SmallString<256> moduleDir;
llvm::sys::path::append(moduleDir, path, "Modules",
name + moduleSuffix);
if (!checkTargetFiles(moduleDir))
return;
names.push_back(Ctx.getIdentifier(name));
});
return std::nullopt;
}
}
llvm_unreachable("covered switch");
});
}
void ImplicitSerializedModuleLoader::collectVisibleTopLevelModuleNames(
SmallVectorImpl<Identifier> &names) const {
collectVisibleTopLevelModuleNamesImpl(
names, file_types::getExtension(file_types::TY_SwiftModuleFile));
}
std::error_code SerializedModuleLoaderBase::openModuleDocFileIfPresent(
ImportPath::Element ModuleID,
const SerializedModuleBaseName &BaseName,
std::unique_ptr<llvm::MemoryBuffer> *ModuleDocBuffer) {
if (!ModuleDocBuffer)
return std::error_code();
llvm::vfs::FileSystem &FS = *Ctx.SourceMgr.getFileSystem();
// Try to open the module documentation file. If it does not exist, ignore
// the error. However, pass though all other errors.
SmallString<256>
ModuleDocPath{BaseName.getName(file_types::TY_SwiftModuleDocFile)};
llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> ModuleDocOrErr =
FS.getBufferForFile(ModuleDocPath);
if (ModuleDocOrErr) {
*ModuleDocBuffer = std::move(*ModuleDocOrErr);
} else if (ModuleDocOrErr.getError() !=
std::errc::no_such_file_or_directory) {
return ModuleDocOrErr.getError();
}
return std::error_code();
}
std::unique_ptr<llvm::MemoryBuffer>
SerializedModuleLoaderBase::getModuleName(ASTContext &Ctx, StringRef modulePath,
std::string &Name) {
return ModuleFile::getModuleName(Ctx, modulePath, Name);
}
std::optional<std::string> SerializedModuleLoaderBase::invalidModuleReason(serialization::Status status) {
using namespace serialization;
switch (status) {
case Status::FormatTooOld:
return "compiled with an older version of the compiler";
case Status::FormatTooNew:
return "compiled with a newer version of the compiler";
case Status::RevisionIncompatible:
return "compiled with a different version of the compiler";
case Status::ChannelIncompatible:
return "compiled for a different distribution channel";
case Status::NotInOSSA:
return "module was not built with OSSA";
case Status::MissingDependency:
return "missing dependency";
case Status::MissingUnderlyingModule:
return "missing underlying module";
case Status::CircularDependency:
return "circular dependency";
case Status::FailedToLoadBridgingHeader:
return "failed to load bridging header";
case Status::Malformed:
return "malformed";
case Status::MalformedDocumentation:
return "malformed documentation";
case Status::NameMismatch:
return "name mismatch";
case Status::TargetIncompatible:
return "compiled for a different target platform";
case Status::TargetTooNew:
return "target platform newer than current platform";
case Status::SDKMismatch:
return "SDK does not match";
case Status::Valid:
return std::nullopt;
}
llvm_unreachable("bad status");
}
llvm::ErrorOr<std::vector<ScannerImportStatementInfo>>
SerializedModuleLoaderBase::getMatchingPackageOnlyImportsOfModule(
Twine modulePath, bool isFramework, bool isRequiredOSSAModules,
StringRef SDKName, StringRef packageName, llvm::vfs::FileSystem *fileSystem,
PathObfuscator &recoverer) {
auto moduleBuf = fileSystem->getBufferForFile(modulePath);
if (!moduleBuf)
return moduleBuf.getError();
std::vector<ScannerImportStatementInfo> importedModuleNames;
// Load the module file without validation.
std::shared_ptr<const ModuleFileSharedCore> loadedModuleFile;
serialization::ValidationInfo loadInfo = ModuleFileSharedCore::load(
"", "", std::move(moduleBuf.get()), nullptr, nullptr, isFramework,
isRequiredOSSAModules, SDKName, recoverer, loadedModuleFile);
if (loadedModuleFile->getModulePackageName() != packageName)
return importedModuleNames;
for (const auto &dependency : loadedModuleFile->getDependencies()) {
if (dependency.isHeader())
continue;
if (!dependency.isPackageOnly())
continue;
// Find the top-level module name.
auto modulePathStr = dependency.getPrettyPrintedPath();
StringRef moduleName = modulePathStr;
auto dotPos = moduleName.find('.');
if (dotPos != std::string::npos)
moduleName = moduleName.slice(0, dotPos);
importedModuleNames.push_back({moduleName.str(), dependency.isExported()});
}
return importedModuleNames;
}
std::error_code
SerializedModuleLoaderBase::openModuleSourceInfoFileIfPresent(
ImportPath::Element ModuleID,
const SerializedModuleBaseName &BaseName,
std::unique_ptr<llvm::MemoryBuffer> *ModuleSourceInfoBuffer) {
if (IgnoreSwiftSourceInfoFile || !ModuleSourceInfoBuffer)
return std::error_code();
llvm::vfs::FileSystem &FS = *Ctx.SourceMgr.getFileSystem();
llvm::SmallString<128>
PathWithoutProjectDir{BaseName.getName(file_types::TY_SwiftSourceInfoFile)};
llvm::SmallString<128> PathWithProjectDir = PathWithoutProjectDir;
// Insert "Project" before the filename in PathWithProjectDir.
StringRef FileName = llvm::sys::path::filename(PathWithoutProjectDir);
llvm::sys::path::remove_filename(PathWithProjectDir);
llvm::sys::path::append(PathWithProjectDir, "Project");
llvm::sys::path::append(PathWithProjectDir, FileName);
// Try to open the module source info file from the "Project" directory.
llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>>
ModuleSourceInfoOrErr = FS.getBufferForFile(PathWithProjectDir);
// If it does not exist, try to open the module source info file adjacent to
// the .swiftmodule file.
if (ModuleSourceInfoOrErr.getError() == std::errc::no_such_file_or_directory)
ModuleSourceInfoOrErr = FS.getBufferForFile(PathWithoutProjectDir);
// If we ended up with a different file system error, return it.
if (ModuleSourceInfoOrErr)
*ModuleSourceInfoBuffer = std::move(*ModuleSourceInfoOrErr);
else if (ModuleSourceInfoOrErr.getError() !=
std::errc::no_such_file_or_directory)
return ModuleSourceInfoOrErr.getError();
return std::error_code();
}
std::error_code SerializedModuleLoaderBase::openModuleFile(
ImportPath::Element ModuleID, const SerializedModuleBaseName &BaseName,
std::unique_ptr<llvm::MemoryBuffer> *ModuleBuffer) {
llvm::vfs::FileSystem &FS = *Ctx.SourceMgr.getFileSystem();
// Try to open the module file first. If we fail, don't even look for the
// module documentation file.
SmallString<256> ModulePath{BaseName.getName(file_types::TY_SwiftModuleFile)};
// If there's no buffer to load into, simply check for the existence of
// the module file.
if (!ModuleBuffer) {
llvm::ErrorOr<llvm::vfs::Status> statResult = FS.status(ModulePath);
if (!statResult)
return statResult.getError();
if (!statResult->exists())
return std::make_error_code(std::errc::no_such_file_or_directory);
// FIXME: llvm::vfs::FileSystem doesn't give us information on whether or
// not we can /read/ the file without actually trying to do so.
return std::error_code();
}
// Actually load the file and error out if necessary.
//
// Use the default arguments except for IsVolatile that is set by the
// frontend option -enable-volatile-modules. If set, we avoid the use of
// mmap to workaround issues on NFS when the swiftmodule file loaded changes
// on disk while it's in use.
//
// In practice, a swiftmodule file can chane when a client uses a
// swiftmodule file from a framework while the framework is recompiled and
// installed over existing files. Or when many processes rebuild the same
// module interface.
//
// We have seen these scenarios leading to deserialization errors that on
// the surface look like memory corruption.
//
// rdar://63755989
bool enableVolatileModules = Ctx.LangOpts.EnableVolatileModules;
llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> ModuleOrErr =
FS.getBufferForFile(ModulePath,
/*FileSize=*/-1,
/*RequiresNullTerminator=*/true,
/*IsVolatile=*/enableVolatileModules);
if (!ModuleOrErr)
return ModuleOrErr.getError();
*ModuleBuffer = std::move(ModuleOrErr.get());
return std::error_code();
}
llvm::ErrorOr<SerializedModuleLoaderBase::BinaryModuleImports>
SerializedModuleLoaderBase::getImportsOfModule(
const ModuleFileSharedCore &loadedModuleFile,
ModuleLoadingBehavior transitiveBehavior, StringRef packageName,
bool isTestableImport) {
llvm::StringSet<> importedModuleNames;
llvm::StringSet<> importedExportedModuleNames;
std::string importedHeader = "";
for (const auto &dependency : loadedModuleFile.getDependencies()) {
if (dependency.isHeader()) {
assert(importedHeader.empty() &&
"Unexpected more than one header dependency");
importedHeader = dependency.RawPath;
continue;
}
ModuleLoadingBehavior dependencyTransitiveBehavior =
loadedModuleFile.getTransitiveLoadingBehavior(
dependency,
/*importPrivateDependencies*/ false,
/*isPartialModule*/ false, packageName,
/*resolveInPackageModuleDependencies */ true,
isTestableImport);
if (dependencyTransitiveBehavior > transitiveBehavior)
continue;
// Find the top-level module name.
auto modulePathStr = dependency.getPrettyPrintedPath();
StringRef moduleName = modulePathStr;
auto dotPos = moduleName.find('.');
if (dotPos != std::string::npos)
moduleName = moduleName.slice(0, dotPos);
// Reverse rewrite of user-specified C++ standard
// library module name to one used in the modulemap.
// TODO: If we are going to do this for more than this module,
// we will need a centralized system for doing module import name remap.
if (moduleName == Ctx.Id_CxxStdlib.str())
moduleName = "std";
importedModuleNames.insert(moduleName);
if (dependency.isExported())
importedExportedModuleNames.insert(moduleName);
}
return SerializedModuleLoaderBase::BinaryModuleImports{importedModuleNames,
importedExportedModuleNames,
importedHeader};
}
std::optional<MacroPluginDependency>
SerializedModuleLoaderBase::resolveMacroPlugin(const ExternalMacroPlugin ¯o,
StringRef packageName) {
if (macro.MacroAccess == ExternalMacroPlugin::Access::Internal)
return std::nullopt;
if (macro.MacroAccess == ExternalMacroPlugin::Access::Package &&
packageName != Ctx.LangOpts.PackageName)
return std::nullopt;
auto &loader = Ctx.getPluginLoader();
auto &entry =
loader.lookupPluginByModuleName(Ctx.getIdentifier(macro.ModuleName));
if (entry.libraryPath.empty() && entry.executablePath.empty())
return std::nullopt;
return MacroPluginDependency{entry.libraryPath.str(),
entry.executablePath.str()};
}
llvm::ErrorOr<ModuleDependencyInfo>
SerializedModuleLoaderBase::scanModuleFile(Twine modulePath, bool isFramework,
bool isTestableImport,
bool isCandidateForTextualModule) {
const std::string moduleDocPath;
const std::string sourceInfoPath;
// Read and valid module.
auto moduleBuf = Ctx.SourceMgr.getFileSystem()->getBufferForFile(modulePath);
if (!moduleBuf)
return moduleBuf.getError();
std::shared_ptr<const ModuleFileSharedCore> loadedModuleFile;
serialization::ValidationInfo loadInfo = ModuleFileSharedCore::load(
"", "", std::move(moduleBuf.get()), nullptr, nullptr, isFramework,
isRequiredOSSAModules(), Ctx.LangOpts.SDKName,
Ctx.SearchPathOpts.DeserializedPathRecoverer, loadedModuleFile);
if (Ctx.SearchPathOpts.ScannerModuleValidation) {
// If failed to load, just ignore and return do not found.
if (auto loadFailureReason = invalidModuleReason(loadInfo.status)) {
// If no textual interface was found, then for this dependency
// scanning query this was *the* module discovered, which means
// it would be helpful to let the user know why the scanner
// was not able to use it because the scan will ultimately fail to
// resolve this dependency due to this incompatibility.
if (!isCandidateForTextualModule)
Ctx.Diags.diagnose(SourceLoc(), diag::dependency_scan_module_incompatible,
modulePath.str(), loadFailureReason.value());
if (Ctx.LangOpts.EnableModuleLoadingRemarks)
Ctx.Diags.diagnose(SourceLoc(), diag::dependency_scan_skip_module_invalid,
modulePath.str(), loadFailureReason.value());
return std::make_error_code(std::errc::no_such_file_or_directory);
}
if (isTestableImport && !loadedModuleFile->isTestable()) {
Ctx.Diags.diagnose(SourceLoc(), diag::skip_module_not_testable,
modulePath.str());
return std::make_error_code(std::errc::no_such_file_or_directory);
}
}
// Some transitive dependencies of binary modules are not required to be
// imported during normal builds.
// TODO: This is worth revisiting for debugger purposes where
// loading the module is optional, and implementation-only imports
// from modules with testing enabled where the dependency is
// optional.
auto binaryModuleImports =
getImportsOfModule(*loadedModuleFile, ModuleLoadingBehavior::Required,
Ctx.LangOpts.PackageName, isTestableImport);
// Lookup optional imports of this module also
auto binaryModuleOptionalImports =
getImportsOfModule(*loadedModuleFile, ModuleLoadingBehavior::Optional,
Ctx.LangOpts.PackageName, isTestableImport);
auto importedModuleSet = binaryModuleImports->moduleImports;
std::vector<ScannerImportStatementInfo> moduleImports;
moduleImports.reserve(importedModuleSet.size());
llvm::transform(importedModuleSet.keys(), std::back_inserter(moduleImports),
[&binaryModuleImports](llvm::StringRef N) {
return ScannerImportStatementInfo(
N.str(),
binaryModuleImports->exportedModules.contains(N));
});
auto importedHeader = binaryModuleImports->headerImport;
auto &importedOptionalModuleSet = binaryModuleOptionalImports->moduleImports;
auto &importedExportedOptionalModuleSet =
binaryModuleOptionalImports->exportedModules;
std::vector<ScannerImportStatementInfo> optionalModuleImports;
for (const auto optionalImportedModule : importedOptionalModuleSet.keys())
if (!importedModuleSet.contains(optionalImportedModule))
optionalModuleImports.push_back(
{optionalImportedModule.str(),
importedExportedOptionalModuleSet.contains(optionalImportedModule)});
std::vector<LinkLibrary> linkLibraries;
{
linkLibraries.reserve(loadedModuleFile->getLinkLibraries().size());
llvm::copy(loadedModuleFile->getLinkLibraries(),
std::back_inserter(linkLibraries));
if (loadedModuleFile->isFramework())
linkLibraries.emplace_back(
loadedModuleFile->getName(), LibraryKind::Framework,
loadedModuleFile->isStaticLibrary());
}
// Attempt to resolve the module's defining .swiftinterface path
std::string definingModulePath =
loadedModuleFile->resolveModuleDefiningFilePath(Ctx.SearchPathOpts.getSDKPath());
std::string userModuleVer = loadedModuleFile->getUserModuleVersion().getAsString();
// Map the set of dependencies over to the "module dependencies".
auto dependencies = ModuleDependencyInfo::forSwiftBinaryModule(
modulePath.str(), moduleDocPath, sourceInfoPath, moduleImports,
optionalModuleImports, linkLibraries, importedHeader,
definingModulePath, isFramework, loadedModuleFile->isStaticLibrary(),
/*module-cache-key*/ "", userModuleVer);
for (auto ¯o : loadedModuleFile->getExternalMacros()) {
auto deps =
resolveMacroPlugin(macro, loadedModuleFile->getModulePackageName());
if (!deps)
continue;
dependencies.addMacroDependency(macro.ModuleName, deps->LibraryPath,
deps->ExecutablePath);
}
return std::move(dependencies);
}
std::error_code ImplicitSerializedModuleLoader::findModuleFilesInDirectory(
ImportPath::Element ModuleID, const SerializedModuleBaseName &BaseName,
SmallVectorImpl<char> *ModuleInterfacePath,
SmallVectorImpl<char> *ModuleInterfaceSourcePath,
std::unique_ptr<llvm::MemoryBuffer> *ModuleBuffer,
std::unique_ptr<llvm::MemoryBuffer> *ModuleDocBuffer,
std::unique_ptr<llvm::MemoryBuffer> *ModuleSourceInfoBuffer,
bool skipBuildingInterface, bool IsFramework, bool IsTestableDependencyLookup) {
if (LoadMode == ModuleLoadingMode::OnlyInterface ||
Ctx.IgnoreAdjacentModules)
return std::make_error_code(std::errc::not_supported);
auto ModuleErr = openModuleFile(ModuleID, BaseName, ModuleBuffer);
if (ModuleErr)
return ModuleErr;
if (ModuleInterfaceSourcePath) {
if (auto InterfacePath =
BaseName.findInterfacePath(*Ctx.SourceMgr.getFileSystem(), Ctx))
ModuleInterfaceSourcePath->assign(InterfacePath->begin(),
InterfacePath->end());
}
if (auto ModuleSourceInfoError = openModuleSourceInfoFileIfPresent(
ModuleID, BaseName, ModuleSourceInfoBuffer))
return ModuleSourceInfoError;
if (auto ModuleDocErr =
openModuleDocFileIfPresent(ModuleID, BaseName, ModuleDocBuffer))
return ModuleDocErr;
return std::error_code();
}
bool ImplicitSerializedModuleLoader::maybeDiagnoseTargetMismatch(
SourceLoc sourceLocation, StringRef moduleName,
const SerializedModuleBaseName &absoluteBaseName) {
llvm::vfs::FileSystem &fs = *Ctx.SourceMgr.getFileSystem();
// Get the last component of the base name, which is the target-specific one.
auto target = llvm::sys::path::filename(absoluteBaseName.baseName);
// Strip off the last component to get the .swiftmodule folder.
auto dir = absoluteBaseName.baseName;
llvm::sys::path::remove_filename(dir);
std::error_code errorCode;
std::string foundArchs;
for (llvm::vfs::directory_iterator directoryIterator =
fs.dir_begin(dir, errorCode), endIterator;
directoryIterator != endIterator;
directoryIterator.increment(errorCode)) {
if (errorCode)
return false;
StringRef filePath = directoryIterator->path();
StringRef extension = llvm::sys::path::extension(filePath);
if (file_types::lookupTypeForExtension(extension) ==
file_types::TY_SwiftModuleFile) {
if (!foundArchs.empty())
foundArchs += ", ";
foundArchs += llvm::sys::path::stem(filePath).str();
}
}
if (foundArchs.empty()) {
// Maybe this swiftmodule directory only contains swiftinterfaces, or
// maybe something else is going on. Regardless, we shouldn't emit a
// possibly incorrect diagnostic.
return false;
}
Ctx.Diags.diagnose(sourceLocation, diag::sema_no_import_target, moduleName,
target, foundArchs, dir);
return true;
}
SerializedModuleBaseName::SerializedModuleBaseName(
StringRef parentDir, const SerializedModuleBaseName &name)
: baseName(parentDir) {
llvm::sys::path::append(baseName, name.baseName);
}
std::string SerializedModuleBaseName::getName(file_types::ID fileTy) const {
auto result = baseName;
result += '.';
result += file_types::getExtension(fileTy);
return std::string(result.str());
}
std::optional<std::string>
SerializedModuleBaseName::getPackageInterfacePathIfInSamePackage(
llvm::vfs::FileSystem &fs, ASTContext &ctx) const {
std::string packagePath{
getName(file_types::TY_PackageSwiftModuleInterfaceFile)};
if (fs.exists(packagePath)) {
// Read the interface file and extract its package-name argument value
if (auto packageName = getPackageNameFromInterface(packagePath, fs)) {
// Return the .package.swiftinterface path if the package name applies to
// the importer module.
if (*packageName == ctx.LangOpts.PackageName)
return packagePath;
}
}
return std::nullopt;
}
std::optional<std::string>
SerializedModuleBaseName::getPackageNameFromInterface(
StringRef interfacePath, llvm::vfs::FileSystem &fs) const {
std::optional<std::string> result;
if (auto interfaceFile = fs.getBufferForFile(interfacePath)) {
llvm::BumpPtrAllocator alloc;
llvm::StringSaver argSaver(alloc);
SmallVector<const char *, 8> args;
(void)extractCompilerFlagsFromInterface(
interfacePath, (*interfaceFile)->getBuffer(), argSaver, args);
for (unsigned I = 0, N = args.size(); I + 1 < N; I++) {
StringRef current(args[I]), next(args[I + 1]);
if (current == "-package-name") {
// Instead of `break` here, continue to get the last value in case of
// dupes, to be consistent with the default parsing logic.
result = next;
}
}
}
return result;
}
std::optional<std::string>
SerializedModuleBaseName::findInterfacePath(llvm::vfs::FileSystem &fs,
ASTContext &ctx) const {
std::string interfacePath{getName(file_types::TY_SwiftModuleInterfaceFile)};
// Ensure the public swiftinterface already exists, otherwise bail early
// as it's considered the module doesn't exist.
if (!fs.exists(interfacePath))
return std::nullopt;
// If both -package-name and -experimental-package-interface-load
// are passed to the client, try to look for the package interface
// to load; if either flag is missing, fall back to loading private
// or public interface.
if (!ctx.LangOpts.PackageName.empty() &&
ctx.LangOpts.EnablePackageInterfaceLoad) {
if (auto found =
getPackageInterfacePathIfInSamePackage(fs, ctx))
return *found;
// If package interface is not found, check if we can load the
// public/private interface file by checking:
// * if AllowNonPackageInterfaceImportFromSamePackage is true
// * if the package name is not equal so not in the same package.
if (!ctx.LangOpts.AllowNonPackageInterfaceImportFromSamePackage) {
if (auto packageName = getPackageNameFromInterface(interfacePath, fs)) {
if (*packageName == ctx.LangOpts.PackageName)
return std::nullopt;
}
}
}
// Otherwise, use the private interface instead of the public one.
std::string privatePath{
getName(file_types::TY_PrivateSwiftModuleInterfaceFile)};
if (fs.exists(privatePath))
return privatePath;
// Otherwise return the public .swiftinterface path
return interfacePath;
}
bool SerializedModuleLoaderBase::findModule(
ImportPath::Element moduleID, SmallVectorImpl<char> *moduleInterfacePath,
SmallVectorImpl<char> *moduleInterfaceSourcePath,
std::unique_ptr<llvm::MemoryBuffer> *moduleBuffer,
std::unique_ptr<llvm::MemoryBuffer> *moduleDocBuffer,
std::unique_ptr<llvm::MemoryBuffer> *moduleSourceInfoBuffer,
bool skipBuildingInterface, bool isTestableDependencyLookup,
bool &isFramework, bool &isSystemModule) {
// Find a module with an actual, physical name on disk, in case
// -module-alias is used (otherwise same).
//
// For example, if '-module-alias Foo=Bar' is passed in to the frontend,
// and a source file has 'import Foo', a module called Bar (real name)
// should be searched.
StringRef moduleNameRef = Ctx.getRealModuleName(moduleID.Item).str();
SmallString<32> moduleName(moduleNameRef);
SerializedModuleBaseName genericBaseName(moduleName);
auto genericModuleFileName =
genericBaseName.getName(file_types::TY_SwiftModuleFile);
SmallVector<SerializedModuleBaseName, 4> targetSpecificBaseNames;
forEachTargetModuleBasename(Ctx, [&](StringRef targetName) {
// Construct a base name like ModuleName.swiftmodule/arch-vendor-os
SmallString<64> targetBaseName{genericModuleFileName};
llvm::sys::path::append(targetBaseName, targetName);
targetSpecificBaseNames.emplace_back(targetBaseName.str());
});
auto &fs = *Ctx.SourceMgr.getFileSystem();
llvm::SmallString<256> currPath;
enum class SearchResult { Found, NotFound, Error };
/// Returns true if a target-specific module file was found, false if an error
/// was diagnosed, or None if neither one happened and the search should
/// continue.
auto findTargetSpecificModuleFiles = [&](bool IsFramework) -> SearchResult {
std::optional<SerializedModuleBaseName> firstAbsoluteBaseName;
for (const auto &targetSpecificBaseName : targetSpecificBaseNames) {
SerializedModuleBaseName absoluteBaseName{currPath,
targetSpecificBaseName};
if (!firstAbsoluteBaseName.has_value())
firstAbsoluteBaseName.emplace(absoluteBaseName);
auto result = findModuleFilesInDirectory(
moduleID, absoluteBaseName, moduleInterfacePath,
moduleInterfaceSourcePath, moduleBuffer, moduleDocBuffer,
moduleSourceInfoBuffer, skipBuildingInterface, IsFramework,
isTestableDependencyLookup);
if (!result)
return SearchResult::Found;
if (result == std::errc::not_supported)
return SearchResult::Error;
if (result != std::errc::no_such_file_or_directory)
return SearchResult::NotFound;
}
// We can only get here if all targetFileNamePairs failed with
// 'std::errc::no_such_file_or_directory'.
if (firstAbsoluteBaseName &&
maybeDiagnoseTargetMismatch(moduleID.Loc, moduleName,
*firstAbsoluteBaseName))
return SearchResult::Error;
return SearchResult::NotFound;
};
SmallVector<std::string, 4> InterestingFilenames = {
(moduleName + ".framework").str(),
genericBaseName.getName(file_types::TY_SwiftModuleInterfaceFile),
genericBaseName.getName(file_types::TY_PrivateSwiftModuleInterfaceFile),
genericBaseName.getName(file_types::TY_PackageSwiftModuleInterfaceFile),
genericBaseName.getName(file_types::TY_SwiftModuleFile)};
auto searchPaths = Ctx.SearchPathOpts.moduleSearchPathsContainingFile(
InterestingFilenames, Ctx.SourceMgr.getFileSystem().get(),
Ctx.LangOpts.Target.isOSDarwin());
for (const auto &searchPath : searchPaths) {
currPath = searchPath->getPath();
isSystemModule = searchPath->isSystem();
switch (searchPath->getKind()) {
case ModuleSearchPathKind::Import:
case ModuleSearchPathKind::RuntimeLibrary: {
isFramework = false;
// On Apple platforms, we can assume that the runtime libraries use
// target-specific module files within a `.swiftmodule` directory.
// This was not always true on non-Apple platforms, and in order to
// ease the transition, check both layouts.
bool checkTargetSpecificModule = true;
if (searchPath->getKind() != ModuleSearchPathKind::RuntimeLibrary ||
!Ctx.LangOpts.Target.isOSDarwin()) {
auto modulePath = currPath;
llvm::sys::path::append(modulePath, genericModuleFileName);
llvm::ErrorOr<llvm::vfs::Status> statResult = fs.status(modulePath);
// Even if stat fails, we can't just return the error; the path
// we're looking for might not be "Foo.swiftmodule".
checkTargetSpecificModule = statResult && statResult->isDirectory();
}
if (checkTargetSpecificModule) {
// A .swiftmodule directory contains architecture-specific files.
switch (findTargetSpecificModuleFiles(isFramework)) {
case SearchResult::Found:
return true;
case SearchResult::NotFound:
continue;
case SearchResult::Error:
return false;
}
}
SerializedModuleBaseName absoluteBaseName{currPath, genericBaseName};
auto result = findModuleFilesInDirectory(
moduleID, absoluteBaseName, moduleInterfacePath,
moduleInterfaceSourcePath, moduleBuffer, moduleDocBuffer,
moduleSourceInfoBuffer, skipBuildingInterface, isFramework,
isTestableDependencyLookup);
if (!result)
return true;
if (result == std::errc::not_supported)
return false;
continue;
}
case ModuleSearchPathKind::Framework:
case ModuleSearchPathKind::DarwinImplicitFramework: {
isFramework = true;
llvm::sys::path::append(currPath, moduleName + ".framework");
// Check if the framework directory exists.
if (!fs.exists(currPath)) {
continue;
}
// Frameworks always use architecture-specific files within a
// .swiftmodule directory.
llvm::sys::path::append(currPath, "Modules");
switch (findTargetSpecificModuleFiles(isFramework)) {
case SearchResult::Found:
return true;
case SearchResult::NotFound:
continue;
case SearchResult::Error:
return false;
}
}
}
llvm_unreachable("covered switch");
}
return false;
}
static std::pair<StringRef, clang::VersionTuple>
getOSAndVersionForDiagnostics(const llvm::Triple &triple) {
StringRef osName;
llvm::VersionTuple osVersion;
if (triple.isMacOSX()) {
// macOS triples represent their versions differently, so we have to use the
// special accessor.