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7fdf642819
During explicit module build, teach dependency scanner to emit the module trace file instead of each following compile job command. This reduces the duplicated info, and allows supporting fully cached build that only loads module from CAS thus cannot produce the path to the original module file on disk. rdar://170007480
125 lines
4.1 KiB
C++
125 lines
4.1 KiB
C++
//===--- ImportedModules.cpp -- generates the list of imported modules ----===//
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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 - 2017 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 https://swift.org/LICENSE.txt for license information
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// See https://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/AST/ASTContext.h"
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#include "swift/AST/Decl.h"
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#include "swift/AST/DiagnosticEngine.h"
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#include "swift/AST/DiagnosticsFrontend.h"
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#include "swift/AST/Module.h"
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#include "swift/Basic/Assertions.h"
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#include "swift/Basic/LLVM.h"
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#include "swift/Basic/STLExtras.h"
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#include "swift/ClangImporter/ClangImporter.h"
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#include "swift/Frontend/FrontendOptions.h"
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#include "swift/FrontendTool/Dependencies.h"
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#include "clang/Basic/Module.h"
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#include "llvm/ADT/SetVector.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/VirtualOutputBackend.h"
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using namespace swift;
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static StringRef getTopLevelName(const clang::Module *module) {
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return module->getTopLevelModule()->Name;
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}
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static void findAllClangImports(const clang::Module *module,
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llvm::SetVector<StringRef> &modules) {
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for (auto imported : module->Imports) {
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modules.insert(getTopLevelName(imported));
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}
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for (auto sub : module->submodules()) {
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findAllClangImports(sub, modules);
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}
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}
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bool swift::emitImportedModules(ModuleDecl *mainModule,
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const FrontendOptions &opts,
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llvm::vfs::OutputBackend &backend) {
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auto &Context = mainModule->getASTContext();
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std::string path = opts.InputsAndOutputs.getSingleOutputFilename();
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auto &diags = Context.Diags;
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auto out = backend.createFile(path);
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if (!out) {
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diags.diagnose(SourceLoc(), diag::error_opening_output,
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path, toString(out.takeError()));
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return true;
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}
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llvm::SetVector<StringRef> Modules;
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// Find the imports in the main Swift code.
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// We don't need `getTopLevelDeclsForDisplay()` here because we only care
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// about `ImportDecl`s.
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llvm::SmallVector<Decl *, 32> Decls;
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mainModule->getDisplayDecls(Decls);
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for (auto D : Decls) {
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auto ID = dyn_cast<ImportDecl>(D);
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if (!ID)
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continue;
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ImportPath::Builder scratch;
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auto modulePath = ID->getRealModulePath(scratch);
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// only the top-level name is needed (i.e. A in A.B.C)
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Modules.insert(modulePath[0].Item.str());
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}
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// And now look in the C code we're possibly using.
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auto clangImporter =
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static_cast<ClangImporter *>(Context.getClangModuleLoader());
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StringRef implicitHeaderPath = opts.ImplicitObjCHeaderPath;
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if (!implicitHeaderPath.empty()) {
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if (!clangImporter->importBridgingHeader(implicitHeaderPath, mainModule)) {
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SmallVector<ImportedModule, 16> imported;
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clangImporter->getImportedHeaderModule()->getImportedModules(
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imported, ModuleDecl::getImportFilterLocal());
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for (auto IM : imported) {
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if (auto clangModule = IM.importedModule->findUnderlyingClangModule())
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Modules.insert(getTopLevelName(clangModule));
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else
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assert(IM.importedModule->isStdlibModule() &&
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"unexpected non-stdlib swift module");
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}
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}
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}
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if (opts.ImportUnderlyingModule) {
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auto underlyingModule = clangImporter->loadModule(SourceLoc(),
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ImportPath::Module::Builder(mainModule->getName()).get());
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if (!underlyingModule) {
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Context.Diags.diagnose(SourceLoc(),
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diag::error_underlying_module_not_found,
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mainModule->getName());
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return true;
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}
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auto clangModule = underlyingModule->findUnderlyingClangModule();
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findAllClangImports(clangModule, Modules);
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}
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for (auto name : Modules) {
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*out << name << "\n";
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}
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if (auto error = out->keep()) {
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diags.diagnose(SourceLoc(), diag::error_closing_output,
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path, toString(std::move(error)));
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return true;
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}
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return false;
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}
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