move some debug routines from final.c to dbxout.c

I was looking at debug_flush_symbol_queue and thought "gosh, it's
inefficient if we're calling this all the time, but it only does work
when we want DBX_DEBUGGING_INFO."  So I looked around and saw that
debug_flush_symbol_queue and friends are only called from dbxout.c.  So
this patch moves them there; any inefficiency can be cleaned up at a
later point in time. ;)

Tested on x86_64-unknown-linux-gnu; verified that DBX_DEBUGGING_INFO is
defined and therefore dbxout.c gets compile-checked.  OK to commit?

-Nathan

	* debug.h (debug_flush_symbol_queue, debug_queue_symbol): Delete.
	(debug_free_queue, debug_nesting, symbol_queue_index): Delete.
	* final.c (debug_flush_symbol_queue, debug_queue_symbol):
	Move these...
	(debug_free_queue, debug_nesting, symbol_queue_index):
	...and these...
	* dbxout.c: ...to here.  Make static.

On Tue, Apr 5, 2011 at 1:36 PM, Nathan Froyd <froydnj@codesourcery.com> wrote:
> I was looking at debug_flush_symbol_queue and thought "gosh, it's
> inefficient if we're calling this all the time, but it only does work
> when we want DBX_DEBUGGING_INFO."  So I looked around and saw that
> debug_flush_symbol_queue and friends are only called from dbxout.c.  So
> this patch moves them there; any inefficiency can be cleaned up at a
> later point in time. ;)
>
> Tested on x86_64-unknown-linux-gnu; verified that DBX_DEBUGGING_INFO is
> defined and therefore dbxout.c gets compile-checked.  OK to commit?

Ok if you built any target with DBX support enabled.

Richard.

> -Nathan
>
>        * debug.h (debug_flush_symbol_queue, debug_queue_symbol): Delete.
>        (debug_free_queue, debug_nesting, symbol_queue_index): Delete.
>        * final.c (debug_flush_symbol_queue, debug_queue_symbol):
>        Move these...
>        (debug_free_queue, debug_nesting, symbol_queue_index):
>        ...and these...
>        * dbxout.c: ...to here.  Make static.
>
> diff --git a/gcc/dbxout.c b/gcc/dbxout.c
> index 89d52a1..5ed9b69 100644
> --- a/gcc/dbxout.c
> +++ b/gcc/dbxout.c
> @@ -96,6 +96,20 @@ along with GCC; see the file COPYING3.  If not see
>  #include "xcoffout.h"
>  #endif
>
> +/* When -gused is used, emit debug info for only used symbols. But in
> +   addition to the standard intercepted debug_hooks there are some
> +   direct calls into this file, i.e., dbxout_symbol, dbxout_parms, and
> +   dbxout_reg_params.  Those routines may also be called from a higher
> +   level intercepted routine. So to prevent recording data for an inner
> +   call to one of these for an intercept, we maintain an intercept
> +   nesting counter (debug_nesting). We only save the intercepted
> +   arguments if the nesting is 1.  */
> +static int debug_nesting = 0;
> +
> +static tree *symbol_queue;
> +static int symbol_queue_index = 0;
> +static int symbol_queue_size = 0;
> +
>  #define DBXOUT_DECR_NESTING \
>   if (--debug_nesting == 0 && symbol_queue_index > 0) \
>     { emit_pending_bincls_if_required (); debug_flush_symbol_queue (); }
> @@ -333,6 +347,7 @@ static const char *dbxout_common_check (tree, int *);
>  static void dbxout_global_decl (tree);
>  static void dbxout_type_decl (tree, int);
>  static void dbxout_handle_pch (unsigned);
> +static void debug_free_queue (void);
>
>  /* The debug hooks structure.  */
>  #if defined (DBX_DEBUGGING_INFO)
> @@ -1403,7 +1418,73 @@ dbxout_type_index (tree type)
>  }
>
>
> +/* Generate the symbols for any queued up type symbols we encountered
> +   while generating the type info for some originally used symbol.
> +   This might generate additional entries in the queue.  Only when
> +   the nesting depth goes to 0 is this routine called.  */
> +
> +static void
> +debug_flush_symbol_queue (void)
> +{
> +  int i;
> +
> +  /* Make sure that additionally queued items are not flushed
> +     prematurely.  */
> +
> +  ++debug_nesting;
> +
> +  for (i = 0; i < symbol_queue_index; ++i)
> +    {
> +      /* If we pushed queued symbols then such symbols must be
> +         output no matter what anyone else says.  Specifically,
> +         we need to make sure dbxout_symbol() thinks the symbol was
> +         used and also we need to override TYPE_DECL_SUPPRESS_DEBUG
> +         which may be set for outside reasons.  */
> +      int saved_tree_used = TREE_USED (symbol_queue[i]);
> +      int saved_suppress_debug = TYPE_DECL_SUPPRESS_DEBUG (symbol_queue[i]);
> +      TREE_USED (symbol_queue[i]) = 1;
> +      TYPE_DECL_SUPPRESS_DEBUG (symbol_queue[i]) = 0;
> +
> +#ifdef DBX_DEBUGGING_INFO
> +      dbxout_symbol (symbol_queue[i], 0);
> +#endif
> +
> +      TREE_USED (symbol_queue[i]) = saved_tree_used;
> +      TYPE_DECL_SUPPRESS_DEBUG (symbol_queue[i]) = saved_suppress_debug;
> +    }
> +
> +  symbol_queue_index = 0;
> +  --debug_nesting;
> +}
>
> +/* Queue a type symbol needed as part of the definition of a decl
> +   symbol.  These symbols are generated when debug_flush_symbol_queue()
> +   is called.  */
> +
> +static void
> +debug_queue_symbol (tree decl)
> +{
> +  if (symbol_queue_index >= symbol_queue_size)
> +    {
> +      symbol_queue_size += 10;
> +      symbol_queue = XRESIZEVEC (tree, symbol_queue, symbol_queue_size);
> +    }
> +
> +  symbol_queue[symbol_queue_index++] = decl;
> +}
> +
> +/* Free symbol queue.  */
> +static void
> +debug_free_queue (void)
> +{
> +  if (symbol_queue)
> +    {
> +      free (symbol_queue);
> +      symbol_queue = NULL;
> +      symbol_queue_size = 0;
> +    }
> +}
> +
>  /* Used in several places: evaluates to '0' for a private decl,
>    '1' for a protected decl, '2' for a public decl.  */
>  #define DECL_ACCESSIBILITY_CHAR(DECL) \
> diff --git a/gcc/debug.h b/gcc/debug.h
> index ffdca54..efdffe1 100644
> --- a/gcc/debug.h
> +++ b/gcc/debug.h
> @@ -186,12 +186,6 @@ extern int dwarf2out_do_frame (void);
>  extern int dwarf2out_do_cfi_asm (void);
>  extern void dwarf2out_switch_text_section (void);
>
> -extern void debug_flush_symbol_queue (void);
> -extern void debug_queue_symbol (tree);
> -extern void debug_free_queue (void);
> -extern int debug_nesting;
> -extern int symbol_queue_index;
> -
>  const char *remap_debug_filename (const char *);
>  void add_debug_prefix_map (const char *);
>
> diff --git a/gcc/final.c b/gcc/final.c
> index cc7234c..3d97397 100644
> --- a/gcc/final.c
> +++ b/gcc/final.c
> @@ -4146,87 +4146,6 @@ leaf_renumber_regs_insn (rtx in_rtx)
>       }
>  }
>  #endif
> -
> -
> -/* When -gused is used, emit debug info for only used symbols. But in
> -   addition to the standard intercepted debug_hooks there are some direct
> -   calls into this file, i.e., dbxout_symbol, dbxout_parms, and dbxout_reg_params.
> -   Those routines may also be called from a higher level intercepted routine. So
> -   to prevent recording data for an inner call to one of these for an intercept,
> -   we maintain an intercept nesting counter (debug_nesting). We only save the
> -   intercepted arguments if the nesting is 1.  */
> -int debug_nesting = 0;
> -
> -static tree *symbol_queue;
> -int symbol_queue_index = 0;
> -static int symbol_queue_size = 0;
> -
> -/* Generate the symbols for any queued up type symbols we encountered
> -   while generating the type info for some originally used symbol.
> -   This might generate additional entries in the queue.  Only when
> -   the nesting depth goes to 0 is this routine called.  */
> -
> -void
> -debug_flush_symbol_queue (void)
> -{
> -  int i;
> -
> -  /* Make sure that additionally queued items are not flushed
> -     prematurely.  */
> -
> -  ++debug_nesting;
> -
> -  for (i = 0; i < symbol_queue_index; ++i)
> -    {
> -      /* If we pushed queued symbols then such symbols must be
> -         output no matter what anyone else says.  Specifically,
> -         we need to make sure dbxout_symbol() thinks the symbol was
> -         used and also we need to override TYPE_DECL_SUPPRESS_DEBUG
> -         which may be set for outside reasons.  */
> -      int saved_tree_used = TREE_USED (symbol_queue[i]);
> -      int saved_suppress_debug = TYPE_DECL_SUPPRESS_DEBUG (symbol_queue[i]);
> -      TREE_USED (symbol_queue[i]) = 1;
> -      TYPE_DECL_SUPPRESS_DEBUG (symbol_queue[i]) = 0;
> -
> -#ifdef DBX_DEBUGGING_INFO
> -      dbxout_symbol (symbol_queue[i], 0);
> -#endif
> -
> -      TREE_USED (symbol_queue[i]) = saved_tree_used;
> -      TYPE_DECL_SUPPRESS_DEBUG (symbol_queue[i]) = saved_suppress_debug;
> -    }
> -
> -  symbol_queue_index = 0;
> -  --debug_nesting;
> -}
> -
> -/* Queue a type symbol needed as part of the definition of a decl
> -   symbol.  These symbols are generated when debug_flush_symbol_queue()
> -   is called.  */
> -
> -void
> -debug_queue_symbol (tree decl)
> -{
> -  if (symbol_queue_index >= symbol_queue_size)
> -    {
> -      symbol_queue_size += 10;
> -      symbol_queue = XRESIZEVEC (tree, symbol_queue, symbol_queue_size);
> -    }
> -
> -  symbol_queue[symbol_queue_index++] = decl;
> -}
> -
> -/* Free symbol queue.  */
> -void
> -debug_free_queue (void)
> -{
> -  if (symbol_queue)
> -    {
> -      free (symbol_queue);
> -      symbol_queue = NULL;
> -      symbol_queue_size = 0;
> -    }
> -}
>
>  /* Turn the RTL into assembly.  */
>  static unsigned int
>