Use string for callback location info

src/base/closure.h

@@ -12,12 +12,11 @@
 
 // Helper for logging location info, e.g. LOG << LOCATION(from)
 #define LOCATION(from)                                                 \
-  std::get<0>(from) << "() [" << [](const char* path) -> std::string { \
-    std::string file_name(path);                                       \
-    size_t last_slash_pos = file_name.find_last_of("\\/");             \
+  std::get<0>(from) << "() [" << [](std::string path) -> std::string { \
+    size_t last_slash_pos = path.find_last_of("\\/");                  \
     if (last_slash_pos != std::string::npos)                           \
-      file_name = file_name.substr(last_slash_pos + 1);                \
-    return file_name;                                                  \
+      path = path.substr(last_slash_pos + 1);                          \
+    return path;                                                       \
   }(std::get<1>(from)) << ":"                                          \
                        << std::get<2>(from) << "]"
 
@@ -36,7 +35,7 @@ using Closure = std::function<void()>;
 
 // Provides location info (function name, file name and line number) where of a
 // Closure was constructed.
-using Location = std::tuple<const char*, const char*, int>;
+using Location = std::tuple<std::string, std::string, int>;
 
 #else
 

src/base/task_runner.cc

@@ -36,7 +36,7 @@ TaskRunner* TaskRunner::GetThreadLocalTaskRunner() {
   return thread_local_task_runner.get();
 }
 
-void TaskRunner::PostTask(const Location& from, Closure task) {
+void TaskRunner::PostTask(Location from, Closure task) {
   DCHECK(task) << LOCATION(from);
 
   task_count_.fetch_add(1, std::memory_order_relaxed);
@@ -44,9 +44,7 @@ void TaskRunner::PostTask(const Location& from, Closure task) {
   queue_.emplace_back(from, std::move(task));
 }
 
-void TaskRunner::PostTaskAndReply(const Location& from,
-                                  Closure task,
-                                  Closure reply) {
+void TaskRunner::PostTaskAndReply(Location from, Closure task, Closure reply) {
   DCHECK(task) << LOCATION(from);
   DCHECK(reply) << LOCATION(from);
   DCHECK(thread_local_task_runner) << LOCATION(from);

src/base/task_runner.h

@@ -42,12 +42,12 @@ class TaskRunner {
   TaskRunner() = default;
   ~TaskRunner() = default;
 
-  void PostTask(const Location& from, Closure task);
+  void PostTask(Location from, Closure task);
 
-  void PostTaskAndReply(const Location& from, Closure task, Closure reply);
+  void PostTaskAndReply(Location from, Closure task, Closure reply);
 
   template <typename ReturnType>
-  void PostTaskAndReplyWithResult(const Location& from,
+  void PostTaskAndReplyWithResult(Location from,
                                   std::function<ReturnType()> task,
                                   std::function<void(ReturnType)> reply) {
     auto* result = new ReturnType;

src/base/thread_pool.cc

@@ -40,16 +40,14 @@ void ThreadPool::Shutdown() {
   threads_.clear();
 }
 
-void ThreadPool::PostTask(const Location& from, Closure task) {
+void ThreadPool::PostTask(Location from, Closure task) {
   DCHECK((!threads_.empty()));
 
   task_runner_.PostTask(from, std::move(task));
   semaphore_.release();
 }
 
-void ThreadPool::PostTaskAndReply(const Location& from,
-                                  Closure task,
-                                  Closure reply) {
+void ThreadPool::PostTaskAndReply(Location from, Closure task, Closure reply) {
   DCHECK((!threads_.empty()));
 
   task_runner_.PostTaskAndReply(from, std::move(task), std::move(reply));

src/base/thread_pool.h

@@ -26,12 +26,12 @@ class ThreadPool {
 
   void Shutdown();
 
-  void PostTask(const Location& from, Closure task);
+  void PostTask(Location from, Closure task);
 
-  void PostTaskAndReply(const Location& from, Closure task, Closure reply);
+  void PostTaskAndReply(Location from, Closure task, Closure reply);
 
   template <typename ReturnType>
-  void PostTaskAndReplyWithResult(const Location& from,
+  void PostTaskAndReplyWithResult(Location from,
                                   std::function<ReturnType()> task,
                                   std::function<void(ReturnType)> reply) {
     task_runner_.PostTaskAndReplyWithResult(from, std::move(task),