Re: [PATCH] Fix REGISTRY cleanups

[Joel Brobecker <brobecker@adacore.com>]

> In registry.c:registry_clear_data, the registered data is iterated and
> invoke each 'free' function with the data passed:
> 
>   for (registration = data_registry->registrations, i = 0;
>        i < fields->num_data;
>        registration = registration->next, i++)
>     if (fields->data[i] != NULL && registration->data->free != NULL)
>       adaptor (registration->data->free, container, fields->data[i]);
> 
> we can see that data is passed to function 'free' and data is not NULL.
> In each usage, we don't have to get the data again through key and
> do NULL pointer checking.
> 
> gdb:
> 
> 2013-10-26  Yao Qi  <yao@codesourcery.com>
> 
> 	* auto-load.c (auto_load_pspace_data_cleanup): Get data from
> 	parameter 'arg' instead of from program_space_data.
> 	* objfiles.c (objfiles_pspace_data_cleanup): Likewise.
> 	* solib-darwin.c (darwin_pspace_data_cleanup): Likewise.
> 	* solib-dsbt.c (dsbt_pspace_data_cleanup): Likewise.
> 	* solib-svr4.c (svr4_pspace_data_cleanup): Likewise.
> 	* inflow.c (inflow_inferior_data_cleanup): Get data from
> 	parameter 'arg' instead of inferior_data.

Looks like a nice simplification, but it should be explicitly documented
in registry.h as well. At the moment, it's not clear what gets passed
to the callback, and because of that, you had to quote the actual code.


> ---
>  gdb/auto-load.c    |   12 ++++--------
>  gdb/inflow.c       |   12 ++++--------
>  gdb/objfiles.c     |   10 +++-------
>  gdb/solib-darwin.c |    5 +----
>  gdb/solib-dsbt.c   |    5 +----
>  gdb/solib-svr4.c   |    6 +-----
>  6 files changed, 14 insertions(+), 36 deletions(-)
> 
> diff --git a/gdb/auto-load.c b/gdb/auto-load.c
> index 4eb7cdd..2c534c7 100644
> --- a/gdb/auto-load.c
> +++ b/gdb/auto-load.c
> @@ -572,15 +572,11 @@ static const struct program_space_data *auto_load_pspace_data;
>  static void
>  auto_load_pspace_data_cleanup (struct program_space *pspace, void *arg)
>  {
> -  struct auto_load_pspace_info *info;
> +  struct auto_load_pspace_info *info = arg;
>  
> -  info = program_space_data (pspace, auto_load_pspace_data);
> -  if (info != NULL)
> -    {
> -      if (info->loaded_scripts)
> -	htab_delete (info->loaded_scripts);
> -      xfree (info);
> -    }
> +  if (info->loaded_scripts)
> +    htab_delete (info->loaded_scripts);
> +  xfree (info);
>  }
>  
>  /* Get the current autoload data.  If none is found yet, add it now.  This
> diff --git a/gdb/inflow.c b/gdb/inflow.c
> index f64c0c1..ad73efe 100644
> --- a/gdb/inflow.c
> +++ b/gdb/inflow.c
> @@ -487,15 +487,11 @@ static const struct inferior_data *inflow_inferior_data;
>  static void
>  inflow_inferior_data_cleanup (struct inferior *inf, void *arg)
>  {
> -  struct terminal_info *info;
> +  struct terminal_info *info = arg;
>  
> -  info = inferior_data (inf, inflow_inferior_data);
> -  if (info != NULL)
> -    {
> -      xfree (info->run_terminal);
> -      xfree (info->ttystate);
> -      xfree (info);
> -    }
> +  xfree (info->run_terminal);
> +  xfree (info->ttystate);
> +  xfree (info);
>  }
>  
>  /* Get the current svr4 data.  If none is found yet, add it now.  This
> diff --git a/gdb/objfiles.c b/gdb/objfiles.c
> index d1f3121..7029196 100644
> --- a/gdb/objfiles.c
> +++ b/gdb/objfiles.c
> @@ -85,14 +85,10 @@ static const struct program_space_data *objfiles_pspace_data;
>  static void
>  objfiles_pspace_data_cleanup (struct program_space *pspace, void *arg)
>  {
> -  struct objfile_pspace_info *info;
> +  struct objfile_pspace_info *info = arg;
>  
> -  info = program_space_data (pspace, objfiles_pspace_data);
> -  if (info != NULL)
> -    {
> -      xfree (info->sections);
> -      xfree (info);
> -    }
> +  xfree (info->sections);
> +  xfree (info);
>  }
>  
>  /* Get the current svr4 data.  If none is found yet, add it now.  This
> diff --git a/gdb/solib-darwin.c b/gdb/solib-darwin.c
> index c4c6308..c37049a 100644
> --- a/gdb/solib-darwin.c
> +++ b/gdb/solib-darwin.c
> @@ -88,10 +88,7 @@ static const struct program_space_data *solib_darwin_pspace_data;
>  static void
>  darwin_pspace_data_cleanup (struct program_space *pspace, void *arg)
>  {
> -  struct darwin_info *info;
> -
> -  info = program_space_data (pspace, solib_darwin_pspace_data);
> -  xfree (info);
> +  xfree (arg);
>  }
>  
>  /* Get the current darwin data.  If none is found yet, add it now.  This
> diff --git a/gdb/solib-dsbt.c b/gdb/solib-dsbt.c
> index 4fe24f8..4e2091b 100644
> --- a/gdb/solib-dsbt.c
> +++ b/gdb/solib-dsbt.c
> @@ -166,10 +166,7 @@ static const struct program_space_data *solib_dsbt_pspace_data;
>  static void
>  dsbt_pspace_data_cleanup (struct program_space *pspace, void *arg)
>  {
> -  struct dsbt_info *info;
> -
> -  info = program_space_data (pspace, solib_dsbt_pspace_data);
> -  xfree (info);
> +  xfree (arg);
>  }
>  
>  /* Get the current dsbt data.  If none is found yet, add it now.  This
> diff --git a/gdb/solib-svr4.c b/gdb/solib-svr4.c
> index ddbbd94..3eea057 100644
> --- a/gdb/solib-svr4.c
> +++ b/gdb/solib-svr4.c
> @@ -407,11 +407,7 @@ free_solib_list (struct svr4_info *info)
>  static void
>  svr4_pspace_data_cleanup (struct program_space *pspace, void *arg)
>  {
> -  struct svr4_info *info;
> -
> -  info = program_space_data (pspace, solib_svr4_pspace_data);
> -  if (info == NULL)
> -    return;
> +  struct svr4_info *info = arg;
>  
>    free_probes_table (info);
>    free_solib_list (info);
> -- 
> 1.7.7.6

-- 
Joel