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134 lines
4.7 KiB
C++
134 lines
4.7 KiB
C++
//===--- SourceLoader.cpp - Import .swift files as 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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///
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/// \file
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/// \brief A simple module loader that loads .swift source files.
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///
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//===----------------------------------------------------------------------===//
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#include "swift/Sema/SourceLoader.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/DiagnosticsSema.h"
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#include "swift/Parse/DelayedParsingCallbacks.h"
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#include "swift/Parse/PersistentParserState.h"
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#include "swift/Basic/SourceManager.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/SaveAndRestore.h"
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#include <system_error>
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using namespace swift;
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// FIXME: Basically the same as SerializedModuleLoader.
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static std::error_code findModule(ASTContext &ctx, StringRef moduleID,
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SourceLoc importLoc,
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std::unique_ptr<llvm::MemoryBuffer> &buffer) {
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llvm::SmallString<128> inputFilename;
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for (auto Path : ctx.SearchPathOpts.ImportSearchPaths) {
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inputFilename = Path;
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llvm::sys::path::append(inputFilename, moduleID);
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inputFilename.append(".swift");
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auto err = llvm::MemoryBuffer::getFile(inputFilename.str(), buffer);
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if (!err || err != std::errc::no_such_file_or_directory)
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return err;
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}
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return make_error_code(std::errc::no_such_file_or_directory);
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}
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namespace {
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/// Don't parse any function bodies except those that are transparent.
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class SkipNonTransparentFunctions : public DelayedParsingCallbacks {
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bool shouldDelayFunctionBodyParsing(Parser &TheParser,
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AbstractFunctionDecl *AFD,
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const DeclAttributes &Attrs,
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SourceRange BodyRange) override {
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return Attrs.isTransparent();
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}
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};
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} // unnamed namespace
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Module *SourceLoader::loadModule(SourceLoc importLoc,
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ArrayRef<std::pair<Identifier, SourceLoc>> path) {
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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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std::unique_ptr<llvm::MemoryBuffer> inputFile;
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if (std::error_code err = findModule(Ctx, moduleID.first.str(),
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moduleID.second, inputFile)) {
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if (err != std::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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addDependency(inputFile->getBufferIdentifier());
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// Turn off debugging while parsing other modules.
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llvm::SaveAndRestore<bool> turnOffDebug(Ctx.LangOpts.DebugConstraintSolver,
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false);
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unsigned bufferID;
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if (auto BufID =
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Ctx.SourceMgr.getIDForBufferIdentifier(inputFile->getBufferIdentifier()))
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bufferID = BufID.getValue();
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else
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bufferID = Ctx.SourceMgr.addNewSourceBuffer(std::move(inputFile));
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auto *importMod = Module::create(moduleID.first, Ctx);
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Ctx.LoadedModules[moduleID.first.str()] = importMod;
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auto implicitImportKind = SourceFile::ImplicitModuleImportKind::Stdlib;
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if (!Ctx.getStdlibModule())
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implicitImportKind = SourceFile::ImplicitModuleImportKind::None;
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auto *importFile = new (Ctx) SourceFile(*importMod, SourceFileKind::Library,
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bufferID, implicitImportKind);
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importMod->addFile(*importFile);
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bool done;
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PersistentParserState persistentState;
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SkipNonTransparentFunctions delayCallbacks;
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parseIntoSourceFile(*importFile, bufferID, &done, nullptr, &persistentState,
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SkipBodies ? &delayCallbacks : nullptr);
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assert(done && "Parser returned early?");
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(void)done;
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if (SkipBodies)
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performDelayedParsing(importMod, persistentState, nullptr);
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// FIXME: Support recursive definitions in immediate modes by making type
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// checking even lazier.
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if (SkipBodies)
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performNameBinding(*importFile);
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else
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performTypeChecking(*importFile, persistentState.getTopLevelContext());
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return importMod;
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}
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void SourceLoader::loadExtensions(NominalTypeDecl *nominal,
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unsigned previousGeneration) {
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// Type-checking the source automatically loads all extensions; there's
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// nothing to do here.
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}
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