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6547b9790a
This unfortunately duplicates the hack of directly referencing the Clang module loader if a cross-reference points to the current module; ideally we'd have some kind of module chain, but I'd settle for a refactoring of the code to share with NameBinding. Additionally, Clang nodes are not actually validated to be from the right module, which could be problematic for extensions or any case of actual name collision. Swift SVN r6519
255 lines
8.7 KiB
C++
255 lines
8.7 KiB
C++
//===--- SerializedModuleLoader.cpp - Import Swift modules ------*- c++ -*-===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2015 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See http://swift.org/LICENSE.txt for license information
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// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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#include "swift/Serialization/SerializedModuleLoader.h"
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#include "ModuleFile.h"
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#include "swift/Subsystems.h"
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#include "swift/AST/AST.h"
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#include "swift/AST/Component.h"
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#include "swift/AST/Diagnostics.h"
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#include "swift/Basic/STLExtras.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/Path.h"
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#include "llvm/Support/SourceMgr.h"
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#include "llvm/Support/system_error.h"
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using namespace swift;
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namespace {
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class SerializedModule : public LoadedModule {
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public:
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ModuleFile *File;
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SerializedModule(ASTContext &ctx, SerializedModuleLoader &owner,
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Identifier name, Component *comp, ModuleFile *file)
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: LoadedModule(DeclContextKind::SerializedModule, name, comp, ctx, owner),
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File(file) {}
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static bool classof(const DeclContext *DC) {
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return DC->getContextKind() == DeclContextKind::SerializedModule;
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}
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};
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typedef std::pair<Identifier, SourceLoc> AccessPathElem;
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}
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// Defined out-of-line so that we can see ~ModuleFile.
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SerializedModuleLoader::SerializedModuleLoader(ASTContext &ctx) : Ctx(ctx) {}
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SerializedModuleLoader::~SerializedModuleLoader() = default;
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// FIXME: Copied from SourceLoader. Not bothering to fix until we decide that
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// the source loader search path should be the same as the module loader search
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// path.
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static llvm::error_code findModule(ASTContext &ctx, AccessPathElem moduleID,
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llvm::OwningPtr<llvm::MemoryBuffer> &buffer){
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llvm::SmallString<64> moduleFilename(moduleID.first.str());
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moduleFilename += '.';
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moduleFilename += SERIALIZED_MODULE_EXTENSION;
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llvm::SmallString<128> inputFilename;
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// First, search in the directory corresponding to the import location.
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// FIXME: This screams for a proper FileManager abstraction.
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llvm::SMLoc rawLoc = moduleID.second.Value;
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int currentBufferID = ctx.SourceMgr.FindBufferContainingLoc(rawLoc);
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if (currentBufferID >= 0) {
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const llvm::MemoryBuffer *importingBuffer
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= ctx.SourceMgr.getBufferInfo(currentBufferID).Buffer;
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StringRef currentDirectory
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= llvm::sys::path::parent_path(importingBuffer->getBufferIdentifier());
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if (!currentDirectory.empty()) {
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inputFilename = currentDirectory;
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llvm::sys::path::append(inputFilename, moduleFilename.str());
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llvm::error_code err = llvm::MemoryBuffer::getFile(inputFilename, buffer);
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if (!err)
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return err;
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}
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}
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// Second, search in the current directory.
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llvm::error_code err = llvm::MemoryBuffer::getFile(moduleFilename, buffer);
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if (!err)
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return err;
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// If we fail, search each import search path.
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for (auto Path : ctx.ImportSearchPaths) {
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inputFilename = Path;
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llvm::sys::path::append(inputFilename, moduleFilename.str());
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err = llvm::MemoryBuffer::getFile(inputFilename, buffer);
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if (!err)
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return err;
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}
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return err;
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}
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static Module *makeTU(ASTContext &ctx, AccessPathElem moduleID,
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ArrayRef<StringRef> inputPaths) {
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// FIXME: The kind of the TU should be read from the serialized file.
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Component *comp = new (ctx.Allocate<Component>(1)) Component();
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TranslationUnit *TU = new (ctx) TranslationUnit(moduleID.first, comp, ctx,
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TranslationUnit::Library);
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TU->HasBuiltinModuleAccess = (moduleID.first.str() == "swift");
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performAutoImport(TU);
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ctx.LoadedModules[moduleID.first.str()] = TU;
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std::vector<unsigned> BufferIDs;
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for (auto &path : inputPaths) {
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// Open the input file.
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llvm::OwningPtr<llvm::MemoryBuffer> InputFile;
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if (llvm::MemoryBuffer::getFileOrSTDIN(path, InputFile))
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return nullptr;
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// Transfer ownership of the MemoryBuffer to the SourceMgr.
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// FIXME: include location
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llvm::SMLoc rawLoc = moduleID.second.Value;
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BufferIDs.push_back(ctx.SourceMgr.AddNewSourceBuffer(InputFile.take(),
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rawLoc));
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}
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for (auto &BufferID : BufferIDs) {
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bool Done;
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do {
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parseIntoTranslationUnit(TU, BufferID, &Done);
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} while (!Done);
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}
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performTypeChecking(TU);
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return TU;
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}
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Module *SerializedModuleLoader::loadModule(SourceLoc importLoc,
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Module::AccessPathTy path,
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bool isStdlibImport) {
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// FIXME: Swift submodules?
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if (path.size() > 1)
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return nullptr;
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auto moduleID = path[0];
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llvm::OwningPtr<llvm::MemoryBuffer> inputFile;
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if (llvm::error_code err = findModule(Ctx, moduleID, inputFile)) {
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if (err.value() != llvm::errc::no_such_file_or_directory) {
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Ctx.Diags.diagnose(moduleID.second, diag::sema_opening_import,
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moduleID.first.str(), err.message());
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}
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return nullptr;
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}
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assert(inputFile);
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llvm::OwningPtr<ModuleFile> loadedModuleFile;
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ModuleStatus err = ModuleFile::load(std::move(inputFile), loadedModuleFile);
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switch (err) {
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case ModuleStatus::FallBackToTranslationUnit:
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return makeTU(Ctx, moduleID, loadedModuleFile->getInputSourcePaths());
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case ModuleStatus::Valid:
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Ctx.bumpGeneration();
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break;
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case ModuleStatus::FormatTooNew:
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Ctx.Diags.diagnose(moduleID.second, diag::serialization_module_too_new);
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loadedModuleFile.reset();
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break;
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case ModuleStatus::Malformed:
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Ctx.Diags.diagnose(moduleID.second, diag::serialization_malformed_module);
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loadedModuleFile.reset();
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break;
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case ModuleStatus::MissingDependency:
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llvm_unreachable("dependencies haven't been loaded yet");
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}
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auto comp = new (Ctx.Allocate<Component>(1)) Component();
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auto module = new (Ctx) SerializedModule(Ctx, *this, moduleID.first, comp,
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loadedModuleFile.get());
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// Whether we succeed or fail, don't try to load this module again.
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Ctx.LoadedModules[moduleID.first.str()] = module;
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if (loadedModuleFile) {
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bool success = loadedModuleFile->associateWithModule(module);
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if (success) {
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LoadedModuleFiles.push_back(std::move(loadedModuleFile));
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} else {
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assert(loadedModuleFile->getStatus() == ModuleStatus::MissingDependency);
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SmallVector<ModuleFile::Dependency, 4> missing;
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std::copy_if(loadedModuleFile->getDependencies().begin(),
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loadedModuleFile->getDependencies().end(),
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std::back_inserter(missing),
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[](const ModuleFile::Dependency &dependency) {
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return dependency.Mod == nullptr;
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});
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assert(!missing.empty() && "unknown missing dependency?");
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if (missing.size() == 1) {
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Ctx.Diags.diagnose(moduleID.second,
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diag::serialization_missing_single_dependency,
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missing.front().Name);
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} else {
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llvm::SmallString<64> missingNames;
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missingNames += '\'';
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interleave(missing,
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[&](const ModuleFile::Dependency &next) {
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missingNames += next.Name;
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},
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[&] { missingNames += "', '"; });
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missingNames += '\'';
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Ctx.Diags.diagnose(moduleID.second,
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diag::serialization_missing_dependencies,
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missingNames);
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}
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module->File = nullptr;
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}
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}
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return module;
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}
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void SerializedModuleLoader::lookupValue(Module *module,
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Module::AccessPathTy accessPath,
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Identifier name, NLKind lookupKind,
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SmallVectorImpl<ValueDecl*> &results) {
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// FIXME: handle nested modules.
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if (!accessPath.empty())
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return;
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ModuleFile *moduleFile = cast<SerializedModule>(module)->File;
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if (!moduleFile)
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return;
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moduleFile->lookupValue(name, results);
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}
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OperatorDecl *SerializedModuleLoader::lookupOperator(Module *module,
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Identifier name,
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DeclKind fixity) {
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ModuleFile *moduleFile = cast<SerializedModule>(module)->File;
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if (!moduleFile)
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return nullptr;
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return moduleFile->lookupOperator(name, fixity);
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}
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void SerializedModuleLoader::loadExtensions(NominalTypeDecl *nominal,
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unsigned previousGeneration) {
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// FIXME: Look for extensions of the given nominal type within the
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// serialized module.
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}
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