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9c85fbc8da
Track if the dependency is static or dynamic. This is in preparation for helping rename the static library to differentiate it from import libraries.
529 lines
21 KiB
C++
529 lines
21 KiB
C++
//===--- ClangModuleDependencyScanner.cpp - Dependency Scanning -----------===//
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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) 2019 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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//
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// This file implements dependency scanning for Clang modules.
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//
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//===----------------------------------------------------------------------===//
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#include "ImporterImpl.h"
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#include "swift/AST/DiagnosticsSema.h"
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#include "swift/AST/ModuleDependencies.h"
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#include "swift/Basic/SourceManager.h"
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#include "swift/ClangImporter/ClangImporter.h"
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#include "swift/Basic/Assertions.h"
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#include "clang/Basic/Diagnostic.h"
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#include "clang/CAS/CASOptions.h"
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#include "clang/Frontend/CompilerInvocation.h"
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#include "clang/Frontend/FrontendOptions.h"
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#include "clang/Tooling/DependencyScanning/DependencyScanningService.h"
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#include "clang/Tooling/DependencyScanning/DependencyScanningTool.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/Support/Allocator.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/Signals.h"
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#include "llvm/Support/Path.h"
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#include "llvm/Support/StringSaver.h"
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using namespace swift;
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using namespace clang::tooling;
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using namespace clang::tooling::dependencies;
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static std::string
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moduleCacheRelativeLookupModuleOutput(const ModuleID &MID, ModuleOutputKind MOK,
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const StringRef moduleCachePath) {
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llvm::SmallString<128> outputPath(moduleCachePath);
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llvm::sys::path::append(outputPath, MID.ModuleName + "-" + MID.ContextHash);
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switch (MOK) {
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case ModuleOutputKind::ModuleFile:
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llvm::sys::path::replace_extension(
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outputPath, getExtension(swift::file_types::TY_ClangModuleFile));
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break;
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case ModuleOutputKind::DependencyFile:
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llvm::sys::path::replace_extension(
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outputPath, getExtension(swift::file_types::TY_Dependencies));
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break;
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case ModuleOutputKind::DependencyTargets:
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return MID.ModuleName + "-" + MID.ContextHash;
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case ModuleOutputKind::DiagnosticSerializationFile:
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llvm::sys::path::replace_extension(
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outputPath, getExtension(swift::file_types::TY_SerializedDiagnostics));
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break;
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}
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return outputPath.str().str();
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}
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static void addScannerPrefixMapperInvocationArguments(
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std::vector<std::string> &invocationArgStrs, ASTContext &ctx) {
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for (const auto &arg : ctx.SearchPathOpts.ScannerPrefixMapper) {
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std::string prefixMapArg = "-fdepscan-prefix-map=" + arg;
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invocationArgStrs.push_back(prefixMapArg);
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}
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}
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/// Create the command line for Clang dependency scanning.
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static std::vector<std::string> getClangDepScanningInvocationArguments(
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ASTContext &ctx, std::optional<StringRef> sourceFileName = std::nullopt) {
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std::vector<std::string> commandLineArgs =
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ClangImporter::getClangDriverArguments(ctx);
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addScannerPrefixMapperInvocationArguments(commandLineArgs, ctx);
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auto sourceFilePos = std::find(
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commandLineArgs.begin(), commandLineArgs.end(),
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"<swift-imported-modules>");
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assert(sourceFilePos != commandLineArgs.end());
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if (sourceFileName.has_value())
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*sourceFilePos = sourceFileName->str();
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else
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commandLineArgs.erase(sourceFilePos);
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// HACK! Drop the -fmodule-format= argument and the one that
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// precedes it.
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{
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auto moduleFormatPos = std::find_if(commandLineArgs.begin(),
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commandLineArgs.end(),
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[](StringRef arg) {
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return arg.starts_with("-fmodule-format=");
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});
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assert(moduleFormatPos != commandLineArgs.end());
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assert(moduleFormatPos != commandLineArgs.begin());
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commandLineArgs.erase(moduleFormatPos-1, moduleFormatPos+1);
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}
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// Use `-fsyntax-only` to do dependency scanning and assert if not there.
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assert(std::find(commandLineArgs.begin(), commandLineArgs.end(),
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"-fsyntax-only") != commandLineArgs.end() &&
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"missing -fsyntax-only option");
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// The Clang modules produced by ClangImporter are always embedded in an
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// ObjectFilePCHContainer and contain -gmodules debug info.
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commandLineArgs.push_back("-gmodules");
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// To use -gmodules we need to have a real path for the PCH; this option has
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// no effect if caching is disabled.
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commandLineArgs.push_back("-Xclang");
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commandLineArgs.push_back("-finclude-tree-preserve-pch-path");
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return commandLineArgs;
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}
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static std::unique_ptr<llvm::PrefixMapper>
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getClangPrefixMapper(DependencyScanningTool &clangScanningTool,
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ModuleDeps &clangModuleDep,
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clang::CompilerInvocation &depsInvocation) {
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std::unique_ptr<llvm::PrefixMapper> Mapper;
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if (clangModuleDep.IncludeTreeID) {
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Mapper = std::make_unique<llvm::PrefixMapper>();
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} else if (clangModuleDep.CASFileSystemRootID) {
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assert(clangScanningTool.getCachingFileSystem());
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Mapper = std::make_unique<llvm::TreePathPrefixMapper>(
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clangScanningTool.getCachingFileSystem());
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}
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if (Mapper)
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DepscanPrefixMapping::configurePrefixMapper(depsInvocation, *Mapper);
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return Mapper;
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}
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ModuleDependencyVector ClangImporter::bridgeClangModuleDependencies(
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clang::tooling::dependencies::DependencyScanningTool &clangScanningTool,
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clang::tooling::dependencies::ModuleDepsGraph &clangDependencies,
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StringRef moduleOutputPath, RemapPathCallback callback) {
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const auto &ctx = Impl.SwiftContext;
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ModuleDependencyVector result;
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auto remapPath = [&](StringRef path) {
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if (callback)
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return callback(path);
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return path.str();
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};
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for (auto &clangModuleDep : clangDependencies) {
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// File dependencies for this module.
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std::vector<std::string> fileDeps;
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clangModuleDep.forEachFileDep(
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[&fileDeps](StringRef fileDep) { fileDeps.emplace_back(fileDep); });
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std::vector<std::string> swiftArgs;
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auto addClangArg = [&](Twine arg) {
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swiftArgs.push_back("-Xcc");
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swiftArgs.push_back(arg.str());
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};
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// We are using Swift frontend mode.
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swiftArgs.push_back("-frontend");
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// Swift frontend action: -emit-pcm
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swiftArgs.push_back("-emit-pcm");
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swiftArgs.push_back("-module-name");
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swiftArgs.push_back(clangModuleDep.ID.ModuleName);
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auto pcmPath = moduleCacheRelativeLookupModuleOutput(
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clangModuleDep.ID, ModuleOutputKind::ModuleFile, moduleOutputPath);
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swiftArgs.push_back("-o");
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swiftArgs.push_back(pcmPath);
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// Ensure that the resulting PCM build invocation uses Clang frontend
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// directly
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swiftArgs.push_back("-direct-clang-cc1-module-build");
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// Swift frontend option for input file path (Foo.modulemap).
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swiftArgs.push_back(remapPath(clangModuleDep.ClangModuleMapFile));
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// Handle VFSOverlay. If include tree is used, there is no need for overlay.
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if (!ctx.ClangImporterOpts.UseClangIncludeTree) {
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for (auto &overlay : ctx.SearchPathOpts.VFSOverlayFiles) {
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swiftArgs.push_back("-vfsoverlay");
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swiftArgs.push_back(remapPath(overlay));
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}
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}
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// Add args reported by the scanner.
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// Round-trip clang args to canonicalize and clear the options that swift
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// compiler doesn't need.
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clang::CompilerInvocation depsInvocation;
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clang::DiagnosticsEngine clangDiags(new clang::DiagnosticIDs(),
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new clang::DiagnosticOptions(),
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new clang::IgnoringDiagConsumer());
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llvm::SmallVector<const char*> clangArgs;
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llvm::for_each(
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clangModuleDep.getBuildArguments(),
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[&](const std::string &Arg) { clangArgs.push_back(Arg.c_str()); });
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bool success = clang::CompilerInvocation::CreateFromArgs(
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depsInvocation, clangArgs, clangDiags);
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(void)success;
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assert(success && "clang option from dep scanner round trip failed");
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// Create a prefix mapper that matches clang's configuration.
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auto Mapper =
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getClangPrefixMapper(clangScanningTool, clangModuleDep, depsInvocation);
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// Clear the cache key for module. The module key is computed from clang
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// invocation, not swift invocation.
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depsInvocation.getFrontendOpts().ModuleCacheKeys.clear();
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depsInvocation.getFrontendOpts().PathPrefixMappings.clear();
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depsInvocation.getFrontendOpts().OutputFile.clear();
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// Reset CASOptions since that should be coming from swift.
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depsInvocation.getCASOpts() = clang::CASOptions();
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depsInvocation.getFrontendOpts().CASIncludeTreeID.clear();
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// FIXME: workaround for rdar://105684525: find the -ivfsoverlay option
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// from clang scanner and pass to swift.
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for (auto overlay : depsInvocation.getHeaderSearchOpts().VFSOverlayFiles) {
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if (llvm::is_contained(ctx.SearchPathOpts.VFSOverlayFiles, overlay))
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continue;
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swiftArgs.push_back("-vfsoverlay");
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swiftArgs.push_back(overlay);
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}
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llvm::BumpPtrAllocator allocator;
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llvm::StringSaver saver(allocator);
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clangArgs.clear();
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depsInvocation.generateCC1CommandLine(
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clangArgs,
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[&saver](const llvm::Twine &T) { return saver.save(T).data(); });
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llvm::for_each(clangArgs, addClangArg);
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// CASFileSystemRootID.
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std::string RootID = clangModuleDep.CASFileSystemRootID
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? clangModuleDep.CASFileSystemRootID->toString()
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: "";
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std::string IncludeTree =
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clangModuleDep.IncludeTreeID ? *clangModuleDep.IncludeTreeID : "";
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ctx.CASOpts.enumerateCASConfigurationFlags(
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[&](StringRef Arg) { swiftArgs.push_back(Arg.str()); });
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if (!RootID.empty()) {
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swiftArgs.push_back("-no-clang-include-tree");
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swiftArgs.push_back("-cas-fs");
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swiftArgs.push_back(RootID);
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}
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if (!IncludeTree.empty()) {
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swiftArgs.push_back("-clang-include-tree-root");
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swiftArgs.push_back(IncludeTree);
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}
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std::string mappedPCMPath = pcmPath;
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if (Mapper)
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Mapper->mapInPlace(mappedPCMPath);
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std::vector<LinkLibrary> LinkLibraries;
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for (const auto &ll : clangModuleDep.LinkLibraries)
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LinkLibraries.emplace_back(
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ll.Library,
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ll.IsFramework ? LibraryKind::Framework : LibraryKind::Library,
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/*static=*/false);
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// Module-level dependencies.
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llvm::StringSet<> alreadyAddedModules;
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auto dependencies = ModuleDependencyInfo::forClangModule(
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pcmPath, mappedPCMPath, clangModuleDep.ClangModuleMapFile,
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clangModuleDep.ID.ContextHash, swiftArgs, fileDeps,
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LinkLibraries, RootID, IncludeTree, /*module-cache-key*/ "",
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clangModuleDep.IsSystem);
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std::vector<ModuleDependencyID> directDependencyIDs;
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for (const auto &moduleName : clangModuleDep.ClangModuleDeps) {
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dependencies.addModuleImport(moduleName.ModuleName, &alreadyAddedModules);
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// It is safe to assume that all dependencies of a Clang module are Clang modules.
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directDependencyIDs.push_back({moduleName.ModuleName, ModuleDependencyKind::Clang});
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}
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dependencies.setImportedClangDependencies(directDependencyIDs);
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result.push_back(std::make_pair(ModuleDependencyID{clangModuleDep.ID.ModuleName,
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ModuleDependencyKind::Clang},
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dependencies));
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}
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return result;
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}
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void ClangImporter::recordBridgingHeaderOptions(
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ModuleDependencyInfo &MDI,
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const clang::tooling::dependencies::TranslationUnitDeps &deps) {
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std::vector<std::string> swiftArgs;
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getBridgingHeaderOptions(deps, swiftArgs);
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MDI.updateBridgingHeaderCommandLine(swiftArgs);
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}
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void ClangImporter::getBridgingHeaderOptions(
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const clang::tooling::dependencies::TranslationUnitDeps &deps,
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std::vector<std::string> &swiftArgs) {
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auto &ctx = Impl.SwiftContext;
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auto addClangArg = [&](Twine arg) {
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swiftArgs.push_back("-Xcc");
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swiftArgs.push_back(arg.str());
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};
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// We are using Swift frontend mode.
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swiftArgs.push_back("-frontend");
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// Swift frontend action: -emit-pcm
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swiftArgs.push_back("-emit-pch");
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// Ensure that the resulting PCM build invocation uses Clang frontend
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// directly
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swiftArgs.push_back("-direct-clang-cc1-module-build");
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// Add args reported by the scanner.
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// Round-trip clang args to canonicalize and clear the options that swift
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// compiler doesn't need.
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clang::CompilerInvocation depsInvocation;
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clang::DiagnosticsEngine clangDiags(new clang::DiagnosticIDs(),
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new clang::DiagnosticOptions(),
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new clang::IgnoringDiagConsumer());
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llvm::SmallVector<const char *> clangArgs;
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llvm::for_each(deps.Commands[0].Arguments, [&](const std::string &Arg) {
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clangArgs.push_back(Arg.c_str());
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});
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bool success = clang::CompilerInvocation::CreateFromArgs(
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depsInvocation, clangArgs, clangDiags);
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(void)success;
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assert(success && "clang option from dep scanner round trip failed");
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// Clear the cache key for module. The module key is computed from clang
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// invocation, not swift invocation.
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depsInvocation.getFrontendOpts().ProgramAction =
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clang::frontend::ActionKind::GeneratePCH;
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depsInvocation.getFrontendOpts().ModuleCacheKeys.clear();
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depsInvocation.getFrontendOpts().PathPrefixMappings.clear();
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depsInvocation.getFrontendOpts().OutputFile.clear();
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llvm::BumpPtrAllocator allocator;
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llvm::StringSaver saver(allocator);
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clangArgs.clear();
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depsInvocation.generateCC1CommandLine(
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clangArgs,
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[&saver](const llvm::Twine &T) { return saver.save(T).data(); });
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llvm::for_each(clangArgs, addClangArg);
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ctx.CASOpts.enumerateCASConfigurationFlags(
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[&](StringRef Arg) { swiftArgs.push_back(Arg.str()); });
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if (auto Tree = deps.IncludeTreeID) {
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swiftArgs.push_back("-clang-include-tree-root");
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swiftArgs.push_back(*Tree);
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}
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if (auto CASFS = deps.CASFileSystemRootID) {
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swiftArgs.push_back("-no-clang-include-tree");
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swiftArgs.push_back("-cas-fs");
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swiftArgs.push_back(*CASFS);
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}
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}
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// The Swift compiler does not have a concept of a working directory.
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// It is instead handled by the Swift driver by resolving relative paths
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// according to the driver's notion of a working directory. On the other hand,
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// Clang does have a concept working directory which may be specified on this
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// Clang invocation with '-working-directory'. If so, it is crucial that we
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// use this directory as an argument to the Clang scanner invocation below.
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static std::optional<std::string>
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computeClangWorkingDirectory(const std::vector<std::string> &commandLineArgs,
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const ASTContext &ctx) {
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std::string workingDir;
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auto clangWorkingDirPos = std::find(
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commandLineArgs.rbegin(), commandLineArgs.rend(), "-working-directory");
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if (clangWorkingDirPos == commandLineArgs.rend())
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workingDir =
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ctx.SourceMgr.getFileSystem()->getCurrentWorkingDirectory().get();
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else {
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if (clangWorkingDirPos - 1 == commandLineArgs.rend()) {
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ctx.Diags.diagnose(SourceLoc(), diag::clang_dependency_scan_error,
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"Missing '-working-directory' argument");
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return std::nullopt;
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}
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workingDir = *(clangWorkingDirPos - 1);
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}
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return workingDir;
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}
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ModuleDependencyVector
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ClangImporter::getModuleDependencies(Identifier moduleName,
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StringRef moduleOutputPath,
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const llvm::DenseSet<clang::tooling::dependencies::ModuleID> &alreadySeenClangModules,
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clang::tooling::dependencies::DependencyScanningTool &clangScanningTool,
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InterfaceSubContextDelegate &delegate,
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llvm::PrefixMapper *mapper,
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bool isTestableImport) {
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auto &ctx = Impl.SwiftContext;
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// Determine the command-line arguments for dependency scanning.
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std::vector<std::string> commandLineArgs =
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getClangDepScanningInvocationArguments(ctx);
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auto optionalWorkingDir = computeClangWorkingDirectory(commandLineArgs, ctx);
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if (!optionalWorkingDir) {
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ctx.Diags.diagnose(SourceLoc(), diag::clang_dependency_scan_error,
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"Missing '-working-directory' argument");
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return {};
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}
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std::string workingDir = *optionalWorkingDir;
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auto lookupModuleOutput =
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[moduleOutputPath](const ModuleID &MID,
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ModuleOutputKind MOK) -> std::string {
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return moduleCacheRelativeLookupModuleOutput(MID, MOK, moduleOutputPath);
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};
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auto clangModuleDependencies =
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clangScanningTool.getModuleDependencies(
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moduleName.str(), commandLineArgs, workingDir,
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alreadySeenClangModules, lookupModuleOutput);
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if (!clangModuleDependencies) {
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auto errorStr = toString(clangModuleDependencies.takeError());
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// We ignore the "module 'foo' not found" error, the Swift dependency
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// scanner will report such an error only if all of the module loaders
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// fail as well.
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if (errorStr.find("fatal error: module '" + moduleName.str().str() +
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"' not found") == std::string::npos)
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ctx.Diags.diagnose(SourceLoc(), diag::clang_dependency_scan_error,
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errorStr);
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return {};
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}
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return bridgeClangModuleDependencies(clangScanningTool,
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*clangModuleDependencies,
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moduleOutputPath, [&](StringRef path) {
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if (mapper)
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return mapper->mapToString(path);
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return path.str();
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});
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}
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bool ClangImporter::getHeaderDependencies(
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ModuleDependencyID moduleID, std::optional<StringRef> headerPath,
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std::optional<llvm::MemoryBufferRef> sourceBuffer,
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clang::tooling::dependencies::DependencyScanningTool &clangScanningTool,
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ModuleDependenciesCache &cache,
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ModuleDependencyIDSetVector &headerClangModuleDependencies,
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std::vector<std::string> &headerFileInputs,
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std::vector<std::string> &bridgingHeaderCommandLine,
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std::optional<std::string> &includeTreeID) {
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// Scan the specified textual header file and collect its dependencies
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auto scanHeaderDependencies = [&]() -> llvm::Expected<TranslationUnitDeps> {
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auto &ctx = Impl.SwiftContext;
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std::vector<std::string> commandLineArgs =
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getClangDepScanningInvocationArguments(ctx, headerPath);
|
|
auto optionalWorkingDir =
|
|
computeClangWorkingDirectory(commandLineArgs, ctx);
|
|
if (!optionalWorkingDir) {
|
|
ctx.Diags.diagnose(SourceLoc(), diag::clang_dependency_scan_error,
|
|
"Missing '-working-directory' argument");
|
|
return llvm::errorCodeToError(
|
|
std::error_code(errno, std::generic_category()));
|
|
}
|
|
std::string workingDir = *optionalWorkingDir;
|
|
auto moduleOutputPath = cache.getModuleOutputPath();
|
|
auto lookupModuleOutput =
|
|
[moduleOutputPath](const ModuleID &MID,
|
|
ModuleOutputKind MOK) -> std::string {
|
|
return moduleCacheRelativeLookupModuleOutput(MID, MOK, moduleOutputPath);
|
|
};
|
|
auto dependencies = clangScanningTool.getTranslationUnitDependencies(
|
|
commandLineArgs, workingDir, cache.getAlreadySeenClangModules(),
|
|
lookupModuleOutput, sourceBuffer);
|
|
if (!dependencies)
|
|
return dependencies.takeError();
|
|
|
|
// Record module dependencies for each new module we found.
|
|
auto bridgedDeps = bridgeClangModuleDependencies(
|
|
clangScanningTool, dependencies->ModuleGraph,
|
|
cache.getModuleOutputPath(),
|
|
[&cache](StringRef path) {
|
|
return cache.getScanService().remapPath(path);
|
|
});
|
|
cache.recordDependencies(bridgedDeps);
|
|
|
|
llvm::copy(dependencies->FileDeps, std::back_inserter(headerFileInputs));
|
|
auto bridgedDependencyIDs =
|
|
llvm::map_range(dependencies->ClangModuleDeps, [](auto &input) {
|
|
return ModuleDependencyID{input.ModuleName, ModuleDependencyKind::Clang};
|
|
});
|
|
headerClangModuleDependencies.insert(bridgedDependencyIDs.begin(),
|
|
bridgedDependencyIDs.end());
|
|
return dependencies;
|
|
};
|
|
|
|
// - If a generated header is provided, scan the generated header.
|
|
// - Textual module dependencies require us to process their bridging header.
|
|
// - Binary module dependnecies may have arbitrary header inputs.
|
|
auto clangModuleDependencies = scanHeaderDependencies();
|
|
if (!clangModuleDependencies) {
|
|
// FIXME: Route this to a normal diagnostic.
|
|
llvm::logAllUnhandledErrors(clangModuleDependencies.takeError(),
|
|
llvm::errs());
|
|
Impl.SwiftContext.Diags.diagnose(
|
|
SourceLoc(), diag::clang_dependency_scan_error,
|
|
"failed to scan bridging header dependencies");
|
|
return true;
|
|
}
|
|
|
|
auto targetModuleInfo = cache.findKnownDependency(moduleID);
|
|
if (!targetModuleInfo.isTextualSwiftModule())
|
|
return false;
|
|
|
|
if (auto TreeID = clangModuleDependencies->IncludeTreeID)
|
|
includeTreeID = TreeID;
|
|
getBridgingHeaderOptions(*clangModuleDependencies, bridgingHeaderCommandLine);
|
|
|
|
return false;
|
|
}
|