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//===--- ImportedModules.cpp -- generates the list of imported 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 "Dependencies.h"
#include "swift/AST/ASTContext.h"
#include "swift/AST/Decl.h"
#include "swift/AST/DiagnosticEngine.h"
#include "swift/AST/DiagnosticsFrontend.h"
#include "swift/AST/Module.h"
#include "swift/Basic/LLVM.h"
#include "swift/Basic/STLExtras.h"
#include "swift/ClangImporter/ClangImporter.h"
#include "swift/Frontend/FrontendOptions.h"
#include "clang/Basic/Module.h"
#include "llvm/ADT/SetVector.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/VirtualOutputBackend.h"
using namespace swift;
static StringRef getTopLevelName(const clang::Module *module) {
return module->getTopLevelModule()->Name;
}
static void findAllClangImports(const clang::Module *module,
llvm::SetVector<StringRef> &modules) {
for (auto imported : module->Imports) {
modules.insert(getTopLevelName(imported));
}
for (auto sub : module->submodules()) {
findAllClangImports(sub, modules);
}
}
bool swift::emitImportedModules(ModuleDecl *mainModule,
const FrontendOptions &opts,
llvm::vfs::OutputBackend &backend) {
auto &Context = mainModule->getASTContext();
std::string path = opts.InputsAndOutputs.getSingleOutputFilename();
auto &diags = Context.Diags;
auto out = backend.createFile(path);
if (!out) {
diags.diagnose(SourceLoc(), diag::error_opening_output,
path, toString(out.takeError()));
return true;
}
llvm::SetVector<StringRef> Modules;
// Find the imports in the main Swift code.
// We don't need `getTopLevelDeclsForDisplay()` here because we only care
// about `ImportDecl`s.
llvm::SmallVector<Decl *, 32> Decls;
mainModule->getDisplayDecls(Decls);
for (auto D : Decls) {
auto ID = dyn_cast<ImportDecl>(D);
if (!ID)
continue;
ImportPath::Builder scratch;
auto modulePath = ID->getRealModulePath(scratch);
// only the top-level name is needed (i.e. A in A.B.C)
Modules.insert(modulePath[0].Item.str());
}
// And now look in the C code we're possibly using.
auto clangImporter =
static_cast<ClangImporter *>(Context.getClangModuleLoader());
StringRef implicitHeaderPath = opts.ImplicitObjCHeaderPath;
if (!implicitHeaderPath.empty()) {
if (!clangImporter->importBridgingHeader(implicitHeaderPath, mainModule)) {
SmallVector<ImportedModule, 16> imported;
clangImporter->getImportedHeaderModule()->getImportedModules(
imported, ModuleDecl::getImportFilterLocal());
for (auto IM : imported) {
if (auto clangModule = IM.importedModule->findUnderlyingClangModule())
Modules.insert(getTopLevelName(clangModule));
else
assert(IM.importedModule->isStdlibModule() &&
"unexpected non-stdlib swift module");
}
}
}
if (opts.ImportUnderlyingModule) {
auto underlyingModule = clangImporter->loadModule(SourceLoc(),
ImportPath::Module::Builder(mainModule->getName()).get());
if (!underlyingModule) {
Context.Diags.diagnose(SourceLoc(),
diag::error_underlying_module_not_found,
mainModule->getName());
return true;
}
auto clangModule = underlyingModule->findUnderlyingClangModule();
findAllClangImports(clangModule, Modules);
}
for (auto name : Modules) {
*out << name << "\n";
}
if (auto error = out->keep()) {
diags.diagnose(SourceLoc(), diag::error_closing_output,
path, toString(std::move(error)));
return true;
}
return false;
}
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