[PING] [PATCH] Cache the text section offset of shared libraries

["Hannes Domani via gdb-patches" <gdb-patches@sourceware.org>]

 Ping.

Am Samstag, 21. Dezember 2019, 17:33:49 MEZ hat Hannes Domani via gdb-patches <gdb-patches@sourceware.org> Folgendes geschrieben:

> This improves the startup time of an application with
> >300 dynamically loaded plugins from 2m10s to 10s.
> And the shutdown time improves from 2m to 2s.
>
> gdb/ChangeLog:
>
> 2019-12-21  Hannes Domani  <ssbssa@yahoo.de>
>
>     * i386-cygwin-tdep.c (core_process_module_section): Update.
>     * windows-nat.c (struct lm_info_windows): Add text_offset.
>     (windows_xfer_shared_libraries): Update.
>     * windows-tdep.c (windows_xfer_shared_library):
>     Add text_offset_cached argument.
>     * windows-tdep.h (windows_xfer_shared_library): Update.
> ---
> gdb/i386-cygwin-tdep.c |  2 +-
> gdb/windows-nat.c      |  2 ++
> gdb/windows-tdep.c    | 20 ++++++++++++++------
> gdb/windows-tdep.h    |  1 +
> 4 files changed, 18 insertions(+), 7 deletions(-)
>
> diff --git a/gdb/i386-cygwin-tdep.c b/gdb/i386-cygwin-tdep.c
> index 25c3cfcbb9..6bf6166f73 100644
> --- a/gdb/i386-cygwin-tdep.c
> +++ b/gdb/i386-cygwin-tdep.c
> @@ -137,7 +137,7 @@ core_process_module_section (bfd *abfd, asection *sect, void *obj)
>   /* The first module is the .exe itself.  */
>   if (data->module_count != 0)
>     windows_xfer_shared_library (module_name, base_addr,
> -                data->gdbarch, data->obstack);
> +                NULL, data->gdbarch, data->obstack);
>   data->module_count++;
>
> out:
> diff --git a/gdb/windows-nat.c b/gdb/windows-nat.c
> index 10d5c95d09..6216af8175 100644
> --- a/gdb/windows-nat.c
> +++ b/gdb/windows-nat.c
> @@ -679,6 +679,7 @@ windows_nat_target::store_registers (struct regcache *regcache, int r)
> struct lm_info_windows : public lm_info_base
> {
>   LPVOID load_addr = 0;
> +  CORE_ADDR text_offset = 0;
> };
>
> static struct so_list solib_start, *solib_end;
> @@ -2949,6 +2950,7 @@ windows_xfer_shared_libraries (struct target_ops *ops,
>
>       windows_xfer_shared_library (so->so_name, (CORE_ADDR)
>                   (uintptr_t) li->load_addr,
> +                  &li->text_offset,
>                   target_gdbarch (), &obstack);
>     }
>   obstack_grow_str0 (&obstack, "</library-list>\n");
> diff --git a/gdb/windows-tdep.c b/gdb/windows-tdep.c
> index bb69a79996..6fb119361b 100644
> --- a/gdb/windows-tdep.c
> +++ b/gdb/windows-tdep.c
> @@ -373,19 +373,27 @@ display_tib (const char * args, int from_tty)
>
> void
> windows_xfer_shared_library (const char* so_name, CORE_ADDR load_addr,
> +                CORE_ADDR *text_offset_cached,
>                 struct gdbarch *gdbarch, struct obstack *obstack)
> {
> -  CORE_ADDR text_offset;
> +  CORE_ADDR text_offset = text_offset_cached ? *text_offset_cached : 0;
>
>   obstack_grow_str (obstack, "<library name=\"");
>   std::string p = xml_escape_text (so_name);
>   obstack_grow_str (obstack, p.c_str ());
>   obstack_grow_str (obstack, "\"><segment address=\"");
> -  gdb_bfd_ref_ptr dll (gdb_bfd_open (so_name, gnutarget, -1));
> -  /* The following calls are OK even if dll is NULL.
> -    The default value 0x1000 is returned by pe_text_section_offset
> -    in that case.  */
> -  text_offset = pe_text_section_offset (dll.get ());
> +
> +  if (!text_offset)
> +    {
> +      gdb_bfd_ref_ptr dll (gdb_bfd_open (so_name, gnutarget, -1));
> +      /* The following calls are OK even if dll is NULL.
> +    The default value 0x1000 is returned by pe_text_section_offset
> +    in that case.  */
> +      text_offset = pe_text_section_offset (dll.get ());
> +      if (text_offset_cached)
> +    *text_offset_cached = text_offset;
> +    }
> +
>   obstack_grow_str (obstack, paddress (gdbarch, load_addr + text_offset));
>   obstack_grow_str (obstack, "\"/></library>");
> }
> diff --git a/gdb/windows-tdep.h b/gdb/windows-tdep.h
> index 594c675d97..969afce816 100644
> --- a/gdb/windows-tdep.h
> +++ b/gdb/windows-tdep.h
> @@ -27,6 +27,7 @@ extern void init_w32_command_list (void);
>
> extern void windows_xfer_shared_library (const char* so_name,
>                     CORE_ADDR load_addr,
> +                    CORE_ADDR *text_offset_cached,
>                     struct gdbarch *gdbarch,
>                     struct obstack *obstack);
>
> --
> 2.24.1