DependencyScanningWorker.cpp

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//===- DependencyScanningWorker.cpp - clang-scan-deps worker --------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
 
#include "clang/Tooling/DependencyScanning/DependencyScanningWorker.h"
#include "clang/Basic/DiagnosticDriver.h"
#include "clang/Basic/DiagnosticFrontend.h"
#include "clang/Basic/DiagnosticSerialization.h"
#include "clang/Driver/Compilation.h"
#include "clang/Driver/Driver.h"
#include "clang/Driver/Job.h"
#include "clang/Driver/Tool.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Frontend/CompilerInvocation.h"
#include "clang/Frontend/FrontendActions.h"
#include "clang/Frontend/TextDiagnosticPrinter.h"
#include "clang/Frontend/Utils.h"
#include "clang/Lex/PreprocessorOptions.h"
#include "clang/Serialization/ObjectFilePCHContainerReader.h"
#include "clang/Tooling/DependencyScanning/DependencyScanningService.h"
#include "clang/Tooling/DependencyScanning/ModuleDepCollector.h"
#include "clang/Tooling/Tooling.h"
#include "llvm/ADT/ScopeExit.h"
#include "llvm/Support/Allocator.h"
#include "llvm/Support/Error.h"
#include "llvm/TargetParser/Host.h"
#include <optional>
 
using namespace clang;
using namespace tooling;
using namespace dependencies;
 
namespace {
 
/// Forwards the gatherered dependencies to the consumer.
class DependencyConsumerForwarder : public DependencyFileGenerator {
public:
  DependencyConsumerForwarder(std::unique_ptr<DependencyOutputOptions> Opts,
                              StringRef WorkingDirectory, DependencyConsumer &C)
      : DependencyFileGenerator(*Opts), WorkingDirectory(WorkingDirectory),
        Opts(std::move(Opts)), C(C) {}
 
  void finishedMainFile(DiagnosticsEngine &Diags) override {
    C.handleDependencyOutputOpts(*Opts);
    llvm::SmallString<256> CanonPath;
    for (const auto &File : getDependencies()) {
      CanonPath = File;
      llvm::sys::path::remove_dots(CanonPath, /*remove_dot_dot=*/true);
      llvm::sys::fs::make_absolute(WorkingDirectory, CanonPath);
      C.handleFileDependency(CanonPath);
    }
  }
 
private:
  StringRef WorkingDirectory;
  std::unique_ptr<DependencyOutputOptions> Opts;
  DependencyConsumer &C;
};
 
static bool checkHeaderSearchPaths(const HeaderSearchOptions &HSOpts,
                                   const HeaderSearchOptions &ExistingHSOpts,
                                   DiagnosticsEngine *Diags,
                                   const LangOptions &LangOpts) {
  if (LangOpts.Modules) {
    if (HSOpts.VFSOverlayFiles != ExistingHSOpts.VFSOverlayFiles) {
      if (Diags) {
        Diags->Report(diag::warn_pch_vfsoverlay_mismatch);
        auto VFSNote = [&](int Type, ArrayRef<std::string> VFSOverlays) {
          if (VFSOverlays.empty()) {
            Diags->Report(diag::note_pch_vfsoverlay_empty) <<