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//===--- SourceLoader.cpp - Import .swift files as 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
//
//===----------------------------------------------------------------------===//
///
/// \file
/// A simple module loader that loads .swift source files.
///
//===----------------------------------------------------------------------===//
#include "swift/Sema/SourceLoader.h"
#include "swift/Subsystems.h"
#include "swift/AST/ASTContext.h"
#include "swift/AST/DiagnosticsSema.h"
#include "swift/AST/Module.h"
#include "swift/AST/ModuleDependencies.h"
#include "swift/AST/SourceFile.h"
#include "swift/Parse/PersistentParserState.h"
#include "swift/Basic/SourceManager.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/PrefixMapper.h"
#include "llvm/Support/SaveAndRestore.h"
#include <system_error>
using namespace swift;
// FIXME: Basically the same as SerializedModuleLoader.
using FileOrError = llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>>;
static FileOrError findModule(ASTContext &ctx, Identifier moduleID,
SourceLoc importLoc) {
llvm::SmallString<128> inputFilename;
// 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).str();
for (const auto &Path : ctx.SearchPathOpts.getImportSearchPaths()) {
inputFilename = Path;
llvm::sys::path::append(inputFilename, moduleNameRef);
inputFilename.append(".swift");
llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> FileBufOrErr =
ctx.SourceMgr.getFileSystem()->getBufferForFile(inputFilename.str());
// Return if we loaded a file
if (FileBufOrErr)
return FileBufOrErr;
// Or if we get any error other than the file not existing
auto err = FileBufOrErr.getError();
if (err != std::errc::no_such_file_or_directory)
return FileBufOrErr;
}
return make_error_code(std::errc::no_such_file_or_directory);
}
void SourceLoader::collectVisibleTopLevelModuleNames(
SmallVectorImpl<Identifier> &names) const {
// TODO: Implement?
}
bool SourceLoader::canImportModule(ImportPath::Module path, SourceLoc loc,
ModuleVersionInfo *versionInfo,
bool isTestableDependencyLookup) {
// FIXME: Swift submodules?
if (path.hasSubmodule())
return false;
auto ID = path[0];
// Search the memory buffers to see if we can find this file on disk.
FileOrError inputFileOrError = findModule(Ctx, ID.Item,
ID.Loc);
if (!inputFileOrError) {
auto err = inputFileOrError.getError();
if (err != std::errc::no_such_file_or_directory) {
Ctx.Diags.diagnose(ID.Loc, diag::sema_opening_import,
ID.Item, err.message());
}
return false;
}
return true;
}
ModuleDecl *SourceLoader::loadModule(SourceLoc importLoc,
ImportPath::Module path,
bool AllowMemoryCache) {
// FIXME: Swift submodules?
if (path.size() > 1)
return nullptr;
auto moduleID = path[0];
FileOrError inputFileOrError = findModule(Ctx, moduleID.Item,
moduleID.Loc);
if (!inputFileOrError) {
auto err = inputFileOrError.getError();
if (err != std::errc::no_such_file_or_directory) {
Ctx.Diags.diagnose(moduleID.Loc, diag::sema_opening_import,
moduleID.Item, err.message());
}
return nullptr;
}
std::unique_ptr<llvm::MemoryBuffer> inputFile =
std::move(inputFileOrError.get());
if (dependencyTracker)
dependencyTracker->addDependency(inputFile->getBufferIdentifier(),
/*isSystem=*/false);
unsigned bufferID;
if (auto BufID =
Ctx.SourceMgr.getIDForBufferIdentifier(inputFile->getBufferIdentifier()))
bufferID = BufID.value();
else
bufferID = Ctx.SourceMgr.addNewSourceBuffer(std::move(inputFile));
ImplicitImportInfo importInfo;
importInfo.StdlibKind = Ctx.getStdlibModule() ? ImplicitStdlibKind::Stdlib
: ImplicitStdlibKind::None;
auto *importMod = ModuleDecl::create(moduleID.Item, Ctx, importInfo);
if (EnableLibraryEvolution)
importMod->setResilienceStrategy(ResilienceStrategy::Resilient);
Ctx.addLoadedModule(importMod);
auto *importFile =
new (Ctx) SourceFile(*importMod, SourceFileKind::Library, bufferID,
SourceFile::getDefaultParsingOptions(Ctx.LangOpts));
importMod->addFile(*importFile);
performImportResolution(*importFile);
importMod->setHasResolvedImports();
bindExtensions(*importMod);
return importMod;
}
void SourceLoader::loadExtensions(NominalTypeDecl *nominal,
unsigned previousGeneration) {
// Type-checking the source automatically loads all extensions; there's
// nothing to do here.
}
ModuleDependencyVector
SourceLoader::getModuleDependencies(Identifier moduleName,
StringRef moduleOutputPath,
llvm::IntrusiveRefCntPtr<llvm::cas::CachingOnDiskFileSystem> CacheFS,
const llvm::DenseSet<clang::tooling::dependencies::ModuleID> &alreadySeenClangModules,
clang::tooling::dependencies::DependencyScanningTool &clangScanningTool,
InterfaceSubContextDelegate &delegate,
llvm::TreePathPrefixMapper* mapper,
bool isTestableImport) {
// FIXME: Implement?
return {};
}
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