Re: [RFA] Make dwarf2_free_objfile static

[Andrew Burgess <andrew dot burgess at embecosm dot com>]

* Tom Tromey <tom@tromey.com> [2018-06-05 13:22:27 -0600]:

> I noticed that dwarf2_free_objfile can be made static, by changing it
> to be a registry cleanup function.  This simplifies the code, as well,
> because now symbol readers don't have to explicitly call it.
> 
> Tested by the buildbot.
> 
> gdb/ChangeLog
> 2018-06-05  Tom Tromey  <tom@tromey.com>
> 
> 	* coffread.c (coff_symfile_finish): Update.
> 	* xcoffread.c (xcoff_symfile_finish): Update.
> 	* elfread.c (elf_symfile_finish): Update.
> 	* symfile.h (dwarf2_free_objfile): Don't declare.
> 	* dwarf2read.c (_initialize_dwarf2_read): Use
> 	register_objfile_data_with_cleanup.
> 	(dwarf2_free_objfile): Now static.  Change signature.
> ---
>  gdb/ChangeLog    | 10 ++++++++++
>  gdb/coffread.c   |  2 --
>  gdb/dwarf2read.c | 12 ++++++------
>  gdb/elfread.c    |  1 -
>  gdb/symfile.h    |  2 --
>  gdb/xcoffread.c  |  2 --
>  6 files changed, 16 insertions(+), 13 deletions(-)
> 
> diff --git a/gdb/coffread.c b/gdb/coffread.c
> index bc266fb60e3..30583e1dda4 100644
> --- a/gdb/coffread.c
> +++ b/gdb/coffread.c
> @@ -766,8 +766,6 @@ coff_symfile_finish (struct objfile *objfile)
>  {
>    /* Let stabs reader clean up.  */
>    stabsread_clear_cache ();
> -
> -  dwarf2_free_objfile (objfile);
>  }
>  
>  
> diff --git a/gdb/dwarf2read.c b/gdb/dwarf2read.c
> index 1cabfbb0d45..55377dc1004 100644
> --- a/gdb/dwarf2read.c
> +++ b/gdb/dwarf2read.c
> @@ -25003,13 +25003,13 @@ free_one_cached_comp_unit (struct dwarf2_per_cu_data *target_per_cu)
>      }
>  }
>  
> -/* Release all extra memory associated with OBJFILE.  */
> +/* Cleanup function for the dwarf2_per_objfile data.  */
>  
> -void
> -dwarf2_free_objfile (struct objfile *objfile)
> +static void
> +dwarf2_free_objfile (struct objfile *objfile, void *datum)
>  {
>    struct dwarf2_per_objfile *dwarf2_per_objfile
> -    = get_dwarf2_per_objfile (objfile);
> +    = (struct dwarf2_per_objfile *) datum;

I don't know if we have a preference for static_cast over C style
casting these days?

Otherwise, FWIW, this looks like a nice clean up.

Thanks,
Andrew


>  
>    delete dwarf2_per_objfile;
>  }
> @@ -25331,8 +25331,8 @@ show_check_physname (struct ui_file *file, int from_tty,
>  void
>  _initialize_dwarf2_read (void)
>  {
> -
> -  dwarf2_objfile_data_key = register_objfile_data ();
> +  dwarf2_objfile_data_key
> +    = register_objfile_data_with_cleanup (nullptr, dwarf2_free_objfile);
>  
>    add_prefix_cmd ("dwarf", class_maintenance, set_dwarf_cmd, _("\
>  Set DWARF specific variables.\n\
> diff --git a/gdb/elfread.c b/gdb/elfread.c
> index 0fe2adbd4d2..358ec77b35b 100644
> --- a/gdb/elfread.c
> +++ b/gdb/elfread.c
> @@ -1333,7 +1333,6 @@ elf_new_init (struct objfile *ignore)
>  static void
>  elf_symfile_finish (struct objfile *objfile)
>  {
> -  dwarf2_free_objfile (objfile);
>  }
>  
>  /* ELF specific initialization routine for reading symbols.  */
> diff --git a/gdb/symfile.h b/gdb/symfile.h
> index d9185092eec..62072b104cc 100644
> --- a/gdb/symfile.h
> +++ b/gdb/symfile.h
> @@ -614,8 +614,6 @@ extern bool dwarf2_initialize_objfile (struct objfile *objfile,
>  extern void dwarf2_build_psymtabs (struct objfile *);
>  extern void dwarf2_build_frame_info (struct objfile *);
>  
> -void dwarf2_free_objfile (struct objfile *);
> -
>  /* From mdebugread.c */
>  
>  extern void mdebug_build_psymtabs (minimal_symbol_reader &,
> diff --git a/gdb/xcoffread.c b/gdb/xcoffread.c
> index 7b9694bcff9..79b1df70fd0 100644
> --- a/gdb/xcoffread.c
> +++ b/gdb/xcoffread.c
> @@ -1959,8 +1959,6 @@ xcoff_symfile_finish (struct objfile *objfile)
>        inclTable = NULL;
>      }
>    inclIndx = inclLength = inclDepth = 0;
> -
> -  dwarf2_free_objfile (objfile);
>  }
>  
>  
> -- 
> 2.13.6
>