[lldb][NFCI] Remove FileAction::GetPath (llvm#170764)

This method puts strings into the ConstString pool and vends them as
llvm::StringRefs. Most of the uses only require a `std::string` or a
`const char *`. This can be achieved without wasting memory.

Author: bulbazord

lldb/include/lldb/Host/FileAction.h

@@ -39,8 +39,6 @@ class FileAction {
 
   int GetActionArgument() const { return m_arg; }
 
-  llvm::StringRef GetPath() const;
-
   const FileSpec &GetFileSpec() const;
 
   void Dump(Stream &stream) const;

lldb/source/Host/common/FileAction.cpp

@@ -25,10 +25,6 @@ void FileAction::Clear() {
   m_file_spec.Clear();
 }
 
-llvm::StringRef FileAction::GetPath() const {
-  return m_file_spec.GetPathAsConstString().AsCString();
-}
-
 const FileSpec &FileAction::GetFileSpec() const { return m_file_spec; }
 
 bool FileAction::Open(int fd, const FileSpec &file_spec, bool read,

lldb/source/Host/macosx/objcxx/Host.mm

@@ -1013,20 +1013,29 @@ static Status LaunchProcessXPC(const char *exe_path,
   xpc_dictionary_set_int64(message, LauncherXPCServicePosixspawnFlagsKey,
                            GetPosixspawnFlags(launch_info));
   const FileAction *file_action = launch_info.GetFileActionForFD(STDIN_FILENO);
-  if (file_action && !file_action->GetPath().empty()) {
+  std::string file_action_path;
+  if (file_action)
+    file_action_path = file_action->GetFileSpec().GetPath();
+
+  if (!file_action_path.empty())
     xpc_dictionary_set_string(message, LauncherXPCServiceStdInPathKeyKey,
-                              file_action->GetPath().str().c_str());
-  }
+                              file_action_path.c_str());
+
   file_action = launch_info.GetFileActionForFD(STDOUT_FILENO);
-  if (file_action && !file_action->GetPath().empty()) {
+  if (file_action)
+    file_action_path = file_action->GetFileSpec().GetPath();
+
+  if (!file_action_path.empty())
     xpc_dictionary_set_string(message, LauncherXPCServiceStdOutPathKeyKey,
-                              file_action->GetPath().str().c_str());
-  }
+                              file_action_path.c_str());
+
   file_action = launch_info.GetFileActionForFD(STDERR_FILENO);
-  if (file_action && !file_action->GetPath().empty()) {
+  if (file_action)
+    file_action_path = file_action->GetFileSpec().GetPath();
+
+  if (!file_action_path.empty())
     xpc_dictionary_set_string(message, LauncherXPCServiceStdErrPathKeyKey,
-                              file_action->GetPath().str().c_str());
-  }
+                              file_action_path.c_str());
 
   xpc_object_t reply =
       xpc_connection_send_message_with_reply_sync(conn, message);
@@ -1135,16 +1144,16 @@ static bool AddPosixSpawnFileAction(void *_file_actions, const FileAction *info,
       if (oflag & O_CREAT)
         mode = 0640;
 
-      error = Status(::posix_spawn_file_actions_addopen(
-                         file_actions, info->GetFD(),
-                         info->GetPath().str().c_str(), oflag, mode),
-                     eErrorTypePOSIX);
+      const std::string file_path(info->GetFileSpec().GetPath());
+      error = Status(
+          ::posix_spawn_file_actions_addopen(file_actions, info->GetFD(),
+                                             file_path.c_str(), oflag, mode),
+          eErrorTypePOSIX);
       if (error.Fail())
         LLDB_LOG(log,
                  "error: {0}, posix_spawn_file_actions_addopen (action={1}, "
                  "fd={2}, path='{3}', oflag={4}, mode={5})",
-                 error, file_actions, info->GetFD(), info->GetPath(), oflag,
-                 mode);
+                 error, file_actions, info->GetFD(), file_path, oflag, mode);
     }
     break;
   }

lldb/source/Host/posix/ProcessLauncherPosixFork.cpp

@@ -229,8 +229,8 @@ struct ForkLaunchInfo {
 // End of code running in the child process.
 
 ForkFileAction::ForkFileAction(const FileAction &act)
-    : action(act.GetAction()), fd(act.GetFD()), path(act.GetPath().str()),
-      arg(act.GetActionArgument()) {}
+    : action(act.GetAction()), fd(act.GetFD()),
+      path(act.GetFileSpec().GetPath()), arg(act.GetActionArgument()) {}
 
 static std::vector<ForkFileAction>
 MakeForkActions(const ProcessLaunchInfo &info) {

lldb/source/Target/Target.cpp

@@ -5145,17 +5145,17 @@ void TargetProperties::SetProcessLaunchInfo(
   const FileAction *input_file_action =
       launch_info.GetFileActionForFD(STDIN_FILENO);
   if (input_file_action) {
-    SetStandardInputPath(input_file_action->GetPath());
+    SetStandardInputPath(input_file_action->GetFileSpec().GetPath());
   }
   const FileAction *output_file_action =
       launch_info.GetFileActionForFD(STDOUT_FILENO);
   if (output_file_action) {
-    SetStandardOutputPath(output_file_action->GetPath());
+    SetStandardOutputPath(output_file_action->GetFileSpec().GetPath());
   }
   const FileAction *error_file_action =
       launch_info.GetFileActionForFD(STDERR_FILENO);
   if (error_file_action) {
-    SetStandardErrorPath(error_file_action->GetPath());
+    SetStandardErrorPath(error_file_action->GetFileSpec().GetPath());
   }
   SetDetachOnError(launch_info.GetFlags().Test(lldb::eLaunchFlagDetachOnError));
   SetDisableASLR(launch_info.GetFlags().Test(lldb::eLaunchFlagDisableASLR));