[06/14] Add "objfile" parameter to two partial_symtab methods

  This series will cause partial symtabs to be shared across obfiles.
However, full symtabs and symbols will still be objfile-dependent.
So, a debug info reader will need to know which objfile to consult
when expanding a partial symtab.

This patch adds an objfile parameter to the two relevant methods
partial_symtab.  Current implementations simply ignore them.

gdb/ChangeLog
2020-02-15  Tom Tromey  <tom@tromey.com>

	* psymtab.c (partial_map_expand_apply)
	(psym_find_pc_sect_compunit_symtab, psym_lookup_symbol)
	(psymtab_to_symtab, psym_find_last_source_symtab, dump_psymtab)
	(psym_print_stats, psym_expand_symtabs_for_function)
	(psym_map_symbol_filenames, psym_map_matching_symbols)
	(psym_expand_symtabs_matching)
	(partial_symtab::read_dependencies, maintenance_info_psymtabs)
	(maintenance_check_psymtabs): Update.
	* psympriv.h (struct partial_symtab) <readin_p,
	get_compunit_symtab>: Add objfile parameter.
	(struct standard_psymtab) <readin_p, get_compunit_symtab>:
	Likewise.
---
 gdb/ChangeLog  | 15 +++++++++++++++
 gdb/psympriv.h | 10 +++++-----
 gdb/psymtab.c  | 40 ++++++++++++++++++++--------------------
 3 files changed, 40 insertions(+), 25 deletions(-)
  

On 2/15/20 1:54 PM, Tom Tromey wrote:
> This series will cause partial symtabs to be shared across obfiles.

"across objfiles."

> However, full symtabs and symbols will still be objfile-dependent.
> So, a debug info reader will need to know which objfile to consult
> when expanding a partial symtab.
> 
> This patch adds an objfile parameter to the two relevant methods
> partial_symtab.  Current implementations simply ignore them.
> 
> gdb/ChangeLog
> 2020-02-15  Tom Tromey  <tom@tromey.com>
> 
> 	* psymtab.c (partial_map_expand_apply)
> 	(psym_find_pc_sect_compunit_symtab, psym_lookup_symbol)
> 	(psymtab_to_symtab, psym_find_last_source_symtab, dump_psymtab)
> 	(psym_print_stats, psym_expand_symtabs_for_function)
> 	(psym_map_symbol_filenames, psym_map_matching_symbols)
> 	(psym_expand_symtabs_matching)
> 	(partial_symtab::read_dependencies, maintenance_info_psymtabs)
> 	(maintenance_check_psymtabs): Update.
> 	* psympriv.h (struct partial_symtab) <readin_p,
> 	get_compunit_symtab>: Add objfile parameter.
> 	(struct standard_psymtab) <readin_p, get_compunit_symtab>:
> 	Likewise.
> ---
>   gdb/ChangeLog  | 15 +++++++++++++++
>   gdb/psympriv.h | 10 +++++-----
>   gdb/psymtab.c  | 40 ++++++++++++++++++++--------------------
>   3 files changed, 40 insertions(+), 25 deletions(-)
> 
> diff --git a/gdb/psympriv.h b/gdb/psympriv.h
> index 1b1f57cf764..0270f0bb9b2 100644
> --- a/gdb/psympriv.h
> +++ b/gdb/psympriv.h
> @@ -139,12 +139,12 @@ struct partial_symtab
>   
>     /* Return true if the symtab corresponding to this psymtab has been
>        readin.  */
> -  virtual bool readin_p () const = 0;
> +  virtual bool readin_p (struct objfile *) const = 0;
>   
>     /* Return a pointer to the compunit allocated for this source file.
>        Return nullptr if !readin or if there was no symtab.  */
> -  virtual struct compunit_symtab *get_compunit_symtab () const = 0;
> -
> +  virtual struct compunit_symtab *get_compunit_symtab (struct objfile *) const
> +    = 0;
>   
>     /* Return the raw low text address of this partial_symtab.  */
>     CORE_ADDR raw_text_low () const
> @@ -310,14 +310,14 @@ struct standard_psymtab : public partial_symtab
>     {
>     }
>   
> -  bool readin_p () const override
> +  bool readin_p (struct objfile *) const override
>     {
>       return readin;
>     }
>   
>     /* Return a pointer to the compunit allocated for this source file.
>        Return nullptr if !readin or if there was no symtab.  */
> -  struct compunit_symtab *get_compunit_symtab () const override
> +  struct compunit_symtab *get_compunit_symtab (struct objfile *) const override
>     {
>       return compunit_symtab;
>     }
> diff --git a/gdb/psymtab.c b/gdb/psymtab.c
> index 56576b3bcec..5c23ebfd94c 100644
> --- a/gdb/psymtab.c
> +++ b/gdb/psymtab.c
> @@ -131,7 +131,7 @@ partial_map_expand_apply (struct objfile *objfile,
>     gdb_assert (pst->user == NULL);
>   
>     /* Don't visit already-expanded psymtabs.  */
> -  if (pst->readin_p ())
> +  if (pst->readin_p (objfile))
>       return 0;
>   
>     /* This may expand more than one symtab, and we want to iterate over
> @@ -385,7 +385,7 @@ psym_find_pc_sect_compunit_symtab (struct objfile *objfile,
>   						    msymbol);
>     if (ps != NULL)
>       {
> -      if (warn_if_readin && ps->readin_p ())
> +      if (warn_if_readin && ps->readin_p (objfile))
>   	/* Might want to error() here (in case symtab is corrupt and
>   	   will cause a core dump), but maybe we can successfully
>   	   continue, so let's not.  */
> @@ -393,7 +393,7 @@ psym_find_pc_sect_compunit_symtab (struct objfile *objfile,
>   (Internal error: pc %s in read in psymtab, but not in symtab.)\n"),
>   		 paddress (get_objfile_arch (objfile), pc));
>         psymtab_to_symtab (objfile, ps);
> -      return ps->get_compunit_symtab ();
> +      return ps->get_compunit_symtab (objfile);
>       }
>     return NULL;
>   }
> @@ -484,8 +484,8 @@ psym_lookup_symbol (struct objfile *objfile,
>   
>     for (partial_symtab *ps : require_partial_symbols (objfile, true))
>       {
> -      if (!ps->readin_p () && lookup_partial_symbol (objfile, ps, name,
> -						     psymtab_index, domain))
> +      if (!ps->readin_p (objfile)
> +	  && lookup_partial_symbol (objfile, ps, name, psymtab_index, domain))
>   	{
>   	  struct symbol *sym, *with_opaque = NULL;
>   	  struct compunit_symtab *stab = psymtab_to_symtab (objfile, ps);
> @@ -750,11 +750,11 @@ psymtab_to_symtab (struct objfile *objfile, struct partial_symtab *pst)
>       pst = pst->user;
>   
>     /* If it's been looked up before, return it.  */
> -  if (pst->get_compunit_symtab ())
> -    return pst->get_compunit_symtab ();
> +  if (pst->get_compunit_symtab (objfile))
> +    return pst->get_compunit_symtab (objfile);
>   
>     /* If it has not yet been read in, read it.  */
> -  if (!pst->readin_p ())
> +  if (!pst->readin_p (objfile))
>       {
>         scoped_restore decrementer = increment_reading_symtab ();
>   
> @@ -772,7 +772,7 @@ psymtab_to_symtab (struct objfile *objfile, struct partial_symtab *pst)
>   	printf_filtered (_("done.\n"));
>       }
>   
> -  return pst->get_compunit_symtab ();
> +  return pst->get_compunit_symtab (objfile);
>   }
>   
>   /* Psymtab version of find_last_source_symtab.  See its definition in
> @@ -795,7 +795,7 @@ psym_find_last_source_symtab (struct objfile *ofp)
>   
>     if (cs_pst)
>       {
> -      if (cs_pst->readin_p ())
> +      if (cs_pst->readin_p (ofp))
>   	{
>   	  internal_error (__FILE__, __LINE__,
>   			  _("select_source_symtab: "
> @@ -952,11 +952,11 @@ dump_psymtab (struct objfile *objfile, struct partial_symtab *psymtab,
>     gdb_print_host_address (objfile, outfile);
>     fprintf_filtered (outfile, ")\n");
>   
> -  if (psymtab->readin_p ())
> +  if (psymtab->readin_p (objfile))
>       {
>         fprintf_filtered (outfile,
>   			"  Full symtab was read (at ");
> -      gdb_print_host_address (psymtab->get_compunit_symtab (), outfile);
> +      gdb_print_host_address (psymtab->get_compunit_symtab (objfile), outfile);
>         fprintf_filtered (outfile, ")\n");
>       }
>   
> @@ -1010,7 +1010,7 @@ psym_print_stats (struct objfile *objfile)
>     i = 0;
>     for (partial_symtab *ps : require_partial_symbols (objfile, true))
>       {
> -      if (!ps->readin_p ())
> +      if (!ps->readin_p (objfile))
>   	i++;
>       }
>     printf_filtered (_("  Number of psym tables (not yet expanded): %d\n"), i);
> @@ -1050,7 +1050,7 @@ psym_expand_symtabs_for_function (struct objfile *objfile,
>   {
>     for (partial_symtab *ps : require_partial_symbols (objfile, true))
>       {
> -      if (ps->readin_p ())
> +      if (ps->readin_p (objfile))
>   	continue;
>   
>         if ((lookup_partial_symbol (objfile, ps, func_name, 1, VAR_DOMAIN)
> @@ -1105,7 +1105,7 @@ psym_map_symbol_filenames (struct objfile *objfile,
>       {
>         const char *fullname;
>   
> -      if (ps->readin_p ())
> +      if (ps->readin_p (objfile))
>   	continue;
>   
>         /* We can skip shared psymtabs here, because any file name will be
> @@ -1185,7 +1185,7 @@ psym_map_matching_symbols
>     for (partial_symtab *ps : require_partial_symbols (objfile, true))
>       {
>         QUIT;
> -      if (ps->readin_p ()
> +      if (ps->readin_p (objfile)
>   	  || match_partial_symbol (objfile, ps, global, name, domain,
>   				   ordered_compare))
>   	{
> @@ -1320,7 +1320,7 @@ psym_expand_symtabs_matching
>       {
>         QUIT;
>   
> -      if (ps->readin_p ())
> +      if (ps->readin_p (objfile))
>   	continue;
>   
>         /* We skip shared psymtabs because file-matching doesn't apply
> @@ -1688,7 +1688,7 @@ partial_symtab::read_dependencies (struct objfile *objfile)
>   {
>     for (int i = 0; i < number_of_dependencies; ++i)
>       {
> -      if (!dependencies[i]->readin_p ())
> +      if (!dependencies[i]->readin_p (objfile))
>   	{
>   	  /* Inform about additional files to be read in.  */
>   	  if (info_verbose)
> @@ -2000,7 +2000,7 @@ maintenance_info_psymtabs (const char *regexp, int from_tty)
>   				 host_address_to_string (psymtab));
>   
>   		printf_filtered ("    readin %s\n",
> -				 psymtab->readin_p () ? "yes" : "no");
> +				 psymtab->readin_p (objfile) ? "yes" : "no");
>   		printf_filtered ("    fullname %s\n",
>   				 psymtab->fullname
>   				 ? psymtab->fullname : "(null)");
> @@ -2091,7 +2091,7 @@ maintenance_check_psymtabs (const char *ignore, int from_tty)
>   	/* We don't call psymtab_to_symtab here because that may cause symtab
>   	   expansion.  When debugging a problem it helps if checkers leave
>   	   things unchanged.  */
> -	cust = ps->get_compunit_symtab ();
> +	cust = ps->get_compunit_symtab (objfile);
>   
>   	/* First do some checks that don't require the associated symtab.  */
>   	if (ps->text_high (objfile) < ps->text_low (objfile))
>