[clang][deps] NFC: Handle `DependencyOutputOptions` only once

There's no need to pass `DependencyOutputOptions` to each call of `handleFileDependency`, since the options don't ever change.

This patch adds new `handleDependencyOutputOpts` method to the `DependencyConsumer` interface and the dependency scanner uses it to report the options only once.

Reviewed By: dexonsmith

Differential Revision: https://reviews.llvm.org/D104104

clang/include/clang/Tooling/DependencyScanning/DependencyScanningWorker.h

@@ -34,8 +34,10 @@ class DependencyConsumer {
 public:
   virtual ~DependencyConsumer() {}
 
-  virtual void handleFileDependency(const DependencyOutputOptions &Opts,
-                                    StringRef Filename) = 0;
+  virtual void
+  handleDependencyOutputOpts(const DependencyOutputOptions &Opts) = 0;
+
+  virtual void handleFileDependency(StringRef Filename) = 0;
 
   virtual void handlePrebuiltModuleDependency(PrebuiltModuleDep PMD) = 0;
 

clang/lib/Tooling/DependencyScanning/DependencyScanningTool.cpp

@@ -54,10 +54,12 @@ llvm::Expected<std::string> DependencyScanningTool::getDependencyFile(
   /// Prints out all of the gathered dependencies into a string.
   class MakeDependencyPrinterConsumer : public DependencyConsumer {
   public:
-    void handleFileDependency(const DependencyOutputOptions &Opts,
-                              StringRef File) override {
-      if (!this->Opts)
-        this->Opts = std::make_unique<DependencyOutputOptions>(Opts);
+    void
+    handleDependencyOutputOpts(const DependencyOutputOptions &Opts) override {
+      this->Opts = std::make_unique<DependencyOutputOptions>(Opts);
+    }
+
+    void handleFileDependency(StringRef File) override {
       Dependencies.push_back(std::string(File));
     }
 
@@ -74,8 +76,7 @@ llvm::Expected<std::string> DependencyScanningTool::getDependencyFile(
     void handleContextHash(std::string Hash) override {}
 
     void printDependencies(std::string &S) {
-      if (!Opts)
-        return;
+      assert(Opts && "Handled dependency output options.");
 
       class DependencyPrinter : public DependencyFileGenerator {
       public:
@@ -128,8 +129,10 @@ DependencyScanningTool::getFullDependencies(
     FullDependencyPrinterConsumer(const llvm::StringSet<> &AlreadySeen)
         : AlreadySeen(AlreadySeen) {}
 
-    void handleFileDependency(const DependencyOutputOptions &Opts,
-                              StringRef File) override {
+    void
+    handleDependencyOutputOpts(const DependencyOutputOptions &Opts) override {}
+
+    void handleFileDependency(StringRef File) override {
       Dependencies.push_back(std::string(File));
     }
 

clang/lib/Tooling/DependencyScanning/DependencyScanningWorker.cpp

@@ -32,11 +32,12 @@ public:
       : DependencyFileGenerator(*Opts), 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);
-      C.handleFileDependency(*Opts, CanonPath);
+      C.handleFileDependency(CanonPath);
     }
   }
 

clang/lib/Tooling/DependencyScanning/ModuleDepCollector.cpp

@@ -173,11 +173,13 @@ void ModuleDepCollectorPP::EndOfMainFile() {
   for (const Module *M : DirectModularDeps)
     handleTopLevelModule(M);
 
+  MDC.Consumer.handleDependencyOutputOpts(*MDC.Opts);
+
   for (auto &&I : MDC.ModularDeps)
     MDC.Consumer.handleModuleDependency(I.second);
 
   for (auto &&I : MDC.FileDeps)
-    MDC.Consumer.handleFileDependency(*MDC.Opts, I);
+    MDC.Consumer.handleFileDependency(I);
 
   for (auto &&I : DirectPrebuiltModularDeps)
     MDC.Consumer.handlePrebuiltModuleDependency(PrebuiltModuleDep{I});