Check for inputs not generated by deps

tools/gn/scheduler.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "tools/gn/scheduler.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/strings/string_number_conversions.h"
 #include "tools/gn/standard_out.h"
@@ skipping 90 matching lines @@
 void Scheduler::AddGenDependency(const base::FilePath& file) {
   base::AutoLock lock(lock_);
   gen_dependencies_.push_back(file);
 }
 
 std::vector<base::FilePath> Scheduler::GetGenDependencies() const {
   base::AutoLock lock(lock_);
   return gen_dependencies_;
 }
 
+void Scheduler::AddWrittenFile(const SourceFile& file) {
+  base::AutoLock lock(lock_);
+  written_files_.push_back(file);
+}
+
+void Scheduler::AddUnknownGeneratedInput(const Target* target,
+                                         const SourceFile& file) {
+  base::AutoLock lock(lock_);
+  unknown_generated_inputs_.insert(std::make_pair(file, target));
+}
+
+std::multimap<SourceFile, const Target*>
+    Scheduler::GetUnknownGeneratedInputs() const {
+  base::AutoLock lock(lock_);
+
+  // Remove all unknown inputs that were written files. These are OK as inputs
+  // to build steps since they were written as a side-effect of running GN.
+  //
+  // It's assumed that this function is called once during cleanup to check for
+  // errors, so performing this work in the lock doesn't matter.
+  std::multimap<SourceFile, const Target*> filtered = unknown_generated_inputs_;
+  for (const SourceFile& file : written_files_)
+    filtered.erase(file);
+
+  return filtered;
+}
+
+void Scheduler::ClearUnknownGeneratedInputsAndWrittenFiles() {
+  base::AutoLock lock(lock_);
+  unknown_generated_inputs_.clear();
+  written_files_.clear();
+}
+
 void Scheduler::IncrementWorkCount() {
   base::AtomicRefCountInc(&work_count_);
 }
 
 void Scheduler::DecrementWorkCount() {
   if (!base::AtomicRefCountDec(&work_count_)) {
     if (base::MessageLoop::current() == &main_loop_) {
       OnComplete();
     } else {
       main_loop_.PostTask(FROM_HERE,
@@ skipping 17 matching lines @@
 void Scheduler::DoWork(const base::Closure& closure) {
   closure.Run();
   DecrementWorkCount();
 }
 
 void Scheduler::OnComplete() {
   // Should be called on the main thread.
   DCHECK(base::MessageLoop::current() == main_loop());
   runner_.Quit();
 }