gdb: add setter/getter for inferior arguments

Add args/set_args to the inferior class, remove the set_inferior_args
and get_inferior_args functions, that would just be wrappers around
them.

Change-Id: If87d52f3402ce08be26c32897ae8915d9f6d1ea3

gdb/elf-none-tdep.c

@@ -49,7 +49,7 @@ elf_none_make_corefile_notes (struct gdbarch *gdbarch, bfd *obfd,
       fname = lbasename (exe);
       psargs = std::string (exe);
 
-      const char *infargs = get_inferior_args ();
+      const char *infargs = current_inferior ()->args ();
       if (infargs != nullptr)
 	psargs += " " + std::string (infargs);
 

gdb/fbsd-tdep.c

@@ -684,7 +684,7 @@ fbsd_make_corefile_notes (struct gdbarch *gdbarch, bfd *obfd, int *note_size)
       const char *fname = lbasename (get_exec_file (0));
       std::string psargs = fname;
 
-      const char *infargs = get_inferior_args ();
+      const char *infargs = current_inferior ()->args ();
       if (infargs != NULL)
 	psargs = psargs + " " + infargs;
 

gdb/infcmd.c

@@ -124,33 +124,12 @@ show_inferior_tty_command (struct ui_file *file, int from_tty,
 		      "is \"%s\".\n"), inferior_tty);
 }
 
-const char *
-get_inferior_args (void)
-{
-  if (current_inferior ()->args == nullptr)
-    return "";
-
-  return current_inferior ()->args.get ();
-}
-
-/* Set the arguments for the current inferior.  Ownership of
-   NEWARGS is not transferred.  */
-
-void
-set_inferior_args (const char *newargs)
-{
-  if (newargs != nullptr)
-    current_inferior ()->args = make_unique_xstrdup (newargs);
-  else
-    current_inferior ()->args.reset ();
-}
-
 void
 set_inferior_args_vector (int argc, char **argv)
 {
   gdb::array_view<char * const> args (argv, argc);
   std::string n = construct_inferior_arguments (args);
-  set_inferior_args (n.c_str ());
+  current_inferior ()->set_args (n.c_str ());
 }
 
 /* Notice when `set args' is run.  */
@@ -160,7 +139,7 @@ set_args_command (const char *args, int from_tty, struct cmd_list_element *c)
 {
   /* CLI has assigned the user-provided value to inferior_args_scratch.
      Now route it to current inferior.  */
-  set_inferior_args (inferior_args_scratch);
+  current_inferior ()->set_args (inferior_args_scratch);
 }
 
 /* Notice when `show args' is run.  */
@@ -171,7 +150,8 @@ show_args_command (struct ui_file *file, int from_tty,
 {
   /* Note that we ignore the passed-in value in favor of computing it
      directly.  */
-  deprecated_show_value_hack (file, from_tty, c, get_inferior_args ());
+  deprecated_show_value_hack (file, from_tty, c,
+			      current_inferior ()->args ());
 }
 
 /* Set the inferior current working directory.  If CWD is NULL, unset
@@ -471,7 +451,7 @@ run_command_1 (const char *args, int from_tty, enum run_how run_how)
 
   /* If there were other args, beside '&', process them.  */
   if (args != NULL)
-    set_inferior_args (args);
+    current_inferior ()->set_args (args);
 
   if (from_tty)
     {
@@ -480,13 +460,13 @@ run_command_1 (const char *args, int from_tty, enum run_how run_how)
       if (exec_file)
 	uiout->field_string ("execfile", exec_file);
       uiout->spaces (1);
-      uiout->field_string ("infargs", get_inferior_args ());
+      uiout->field_string ("infargs", current_inferior ()->args ());
       uiout->text ("\n");
       uiout->flush ();
     }
 
   run_target->create_inferior (exec_file,
-			       std::string (get_inferior_args ()),
+			       current_inferior ()->args (),
 			       current_inferior ()->environment.envp (),
 			       from_tty);
   /* to_create_inferior should push the target, so after this point we

gdb/inferior.h

@@ -204,10 +204,6 @@ extern void post_create_inferior (int from_tty);
 
 extern void attach_command (const char *, int);
 
-extern const char *get_inferior_args (void);
-
-extern void set_inferior_args (const char *);
-
 extern void set_inferior_args_vector (int, char **);
 
 extern void registers_info (const char *, int);
@@ -446,6 +442,30 @@ public:
   void set_tty (const char *terminal_name);
   const char *tty ();
 
+  /* Set the argument string to use when running this inferior.
+
+     Either nullptr or an empty string can be used to represent "no
+     arguments".  */
+  void set_args (const char *args)
+  {
+    if (args != nullptr && args[0] != '\0')
+      m_args = make_unique_xstrdup (args);
+    else
+      m_args.reset ();
+  };
+
+  /* Get the argument string to use when running this inferior.
+
+     The return value is always non-nullptr.  No arguments is represented by
+     an empty string.  */
+  const char *args () const
+  {
+    if (m_args == nullptr)
+      return "";
+
+    return m_args.get ();
+  }
+
   /* Convenient handle (GDB inferior id).  Unique across all
      inferiors.  */
   int num = 0;
@@ -475,9 +495,6 @@ public:
   /* The program space bound to this inferior.  */
   struct program_space *pspace = NULL;
 
-  /* The arguments string to use when running.  */
-  gdb::unique_xmalloc_ptr<char> args;
-
   /* The current working directory that will be used when starting
      this inferior.  */
   gdb::unique_xmalloc_ptr<char> cwd;
@@ -569,6 +586,11 @@ private:
 
   /* The list of continuations.  */
   std::list<std::function<void ()>> m_continuations;
+
+  /* The arguments string to use when running.
+
+     This is nullptr when there are not args.  */
+  gdb::unique_xmalloc_ptr<char> m_args;
 };
 
 /* Keep a registry of per-inferior data-pointers required by other GDB

gdb/linux-tdep.c

@@ -1804,7 +1804,6 @@ linux_fill_prpsinfo (struct elf_internal_linux_prpsinfo *p)
   char filename[100];
   /* The basename of the executable.  */
   const char *basename;
-  const char *infargs;
   /* Temporary buffer.  */
   char *tmpstr;
   /* The valid states of a process, according to the Linux kernel.  */
@@ -1848,7 +1847,7 @@ linux_fill_prpsinfo (struct elf_internal_linux_prpsinfo *p)
   strncpy (p->pr_fname, basename, sizeof (p->pr_fname) - 1);
   p->pr_fname[sizeof (p->pr_fname) - 1] = '\0';
 
-  infargs = get_inferior_args ();
+  const char *infargs = current_inferior ()->args ();
 
   /* The arguments of the program.  */
   std::string psargs = fname.get ();

gdb/procfs.c

@@ -3613,7 +3613,7 @@ procfs_target::make_corefile_notes (bfd *obfd, int *note_size)
       strncpy (psargs, get_exec_file (0), sizeof (psargs));
       psargs[sizeof (psargs) - 1] = 0;
 
-      inf_args = get_inferior_args ();
+      inf_args = current_inferior ()->args ();
       if (inf_args && *inf_args
 	  && (strlen (inf_args)
 	      < ((int) sizeof (psargs) - (int) strlen (psargs))))