Make program_space::deleted_solibs a vector of std::string

This allows removing a usage of free_char_ptr_vec.

gdb/ChangeLog:

	* progspace.h (struct program_space) <deleted_solibs>: Change
	type to std::vector<std::string>.
	* progspace.c (clear_program_space_solib_cache): Adjust.
	* breakpoint.c (print_solib_event): Adjust.
	(check_status_catch_solib): Adjust.
	* solib.c (update_solib_list): Adjust.
	* ui-out.h (class ui_out) <field_string>: New overload.
	* ui-out.c (ui_out::field_string): New overload.

gdb/ChangeLog

@@ -1,3 +1,14 @@
+2018-03-02  Simon Marchi  <simon.marchi@polymtl.ca>
+
+	* progspace.h (struct program_space) <deleted_solibs>: Change
+	type to std::vector<std::string>.
+	* progspace.c (clear_program_space_solib_cache): Adjust.
+	* breakpoint.c (print_solib_event): Adjust.
+	(check_status_catch_solib): Adjust.
+	* solib.c (update_solib_list): Adjust.
+	* ui-out.h (class ui_out) <field_string>: New overload.
+	* ui-out.c (ui_out::field_string): New overload.
+
 2018-03-02  Simon Marchi  <simon.marchi@polymtl.ca>
 
 	* progspace.h (struct program_space): Add constructor and

gdb/breakpoint.c

@@ -4604,8 +4604,7 @@ print_bp_stop_message (bpstat bs)
 static void
 print_solib_event (int is_catchpoint)
 {
-  int any_deleted
-    = !VEC_empty (char_ptr, current_program_space->deleted_solibs);
+  bool any_deleted = !current_program_space->deleted_solibs.empty ();
   int any_added
     = !VEC_empty (so_list_ptr, current_program_space->added_solibs);
 
@@ -4624,16 +4623,12 @@ print_solib_event (int is_catchpoint)
 
   if (any_deleted)
     {
-      char *name;
-      int ix;
-
       current_uiout->text (_("  Inferior unloaded "));
       ui_out_emit_list list_emitter (current_uiout, "removed");
-      for (ix = 0;
-	   VEC_iterate (char_ptr, current_program_space->deleted_solibs,
-			ix, name);
-	   ++ix)
+      for (int ix = 0; ix < current_program_space->deleted_solibs.size (); ix++)
 	{
+	  const std::string &name = current_program_space->deleted_solibs[ix];
+
 	  if (ix > 0)
 	    current_uiout->text ("    ");
 	  current_uiout->field_string ("library", name);
@@ -8050,13 +8045,12 @@ check_status_catch_solib (struct bpstats *bs)
 {
   struct solib_catchpoint *self
     = (struct solib_catchpoint *) bs->breakpoint_at;
-  int ix;
 
   if (self->is_load)
     {
       struct so_list *iter;
 
-      for (ix = 0;
+      for (int ix = 0;
 	   VEC_iterate (so_list_ptr, current_program_space->added_solibs,
 			ix, iter);
 	   ++ix)
@@ -8068,15 +8062,10 @@ check_status_catch_solib (struct bpstats *bs)
     }
   else
     {
-      char *iter;
-
-      for (ix = 0;
-	   VEC_iterate (char_ptr, current_program_space->deleted_solibs,
-			ix, iter);
-	   ++ix)
+      for (const std::string &iter : current_program_space->deleted_solibs)
 	{
 	  if (!self->regex
-	      || self->compiled->exec (iter, 0, NULL, 0) == 0)
+	      || self->compiled->exec (iter.c_str (), 0, NULL, 0) == 0)
 	    return;
 	}
     }

gdb/progspace.c

@@ -401,8 +401,7 @@ clear_program_space_solib_cache (struct program_space *pspace)
 {
   VEC_free (so_list_ptr, pspace->added_solibs);
 
-  free_char_ptr_vec (pspace->deleted_solibs);
-  pspace->deleted_solibs = NULL;
+  pspace->deleted_solibs.clear ();
 }
 
 

gdb/progspace.h

@@ -207,7 +207,7 @@ struct program_space
 
   /* When an solib is removed, its name is added to this vector.
      This is so we can properly report solib changes to the user.  */
-  VEC (char_ptr) *deleted_solibs = NULL;
+  std::vector<std::string> deleted_solibs;
 
   /* Per pspace data-pointers required by other GDB modules.  */
   REGISTRY_FIELDS {};

gdb/solib.c

@@ -828,8 +828,7 @@ update_solib_list (int from_tty)
 	     unloaded before we remove it from GDB's tables.  */
 	  observer_notify_solib_unloaded (gdb);
 
-	  VEC_safe_push (char_ptr, current_program_space->deleted_solibs,
-			 xstrdup (gdb->so_name));
+	  current_program_space->deleted_solibs.push_back (gdb->so_name);
 
 	  *gdb_link = gdb->next;
 

gdb/ui-out.c

@@ -552,6 +552,12 @@ ui_out::field_string (const char *fldname, const char *string)
   do_field_string (fldno, width, align, fldname, string);
 }
 
+void
+ui_out::field_string (const char *fldname, const std::string &string)
+{
+  field_string (fldname, string.c_str ());
+}
+
 /* VARARGS */
 void
 ui_out::field_fmt (const char *fldname, const char *format, ...)

gdb/ui-out.h

@@ -104,6 +104,7 @@ class ui_out
   void field_core_addr (const char *fldname, struct gdbarch *gdbarch,
 			CORE_ADDR address);
   void field_string (const char *fldname, const char *string);
+  void field_string (const char *fldname, const std::string &string);
   void field_stream (const char *fldname, string_file &stream);
   void field_skip (const char *fldname);
   void field_fmt (const char *fldname, const char *format, ...)