Re: [patch] Do not add partial_symbol again and again to the list

[Daniel Jacobowitz <drow@false.org>]

On Mon, Feb 11, 2008 at 03:23:35PM -0500, Aleksandar Ristovski wrote:
> The attached patch checks if partial_symbol has already been added to the 
> list instead of adding duplicate records.

How does this ever happen?  It seems very wrong.  Also, I am worried
that the linear search will be a bottleneck (this is quadratic as each
psymtab grows).

> @@ -3102,15 +3103,20 @@ add_psymbol_to_list (char *name, int nam
>  		     enum language language, struct objfile *objfile)
>  {
>    struct partial_symbol *psym;
> -  char *buf = alloca (namelength + 1);
> +  struct partial_symbol **ps;
> +  char *buf = name;  
>    /* psymbol is static so that there will be no uninitialized gaps in the
>       structure which might contain random data, causing cache misses in
>       bcache. */
>    static struct partial_symbol psymbol;
> -
> -  /* Create local copy of the partial symbol */
> -  memcpy (buf, name, namelength);
> -  buf[namelength] = '\0';
> +  
> +  if (name[namelength] != '\0')
> +    {
> +      buf = alloca (namelength + 1);
> +      /* Create local copy of the partial symbol */
> +      memcpy (buf, name, namelength);
> +      buf[namelength] = '\0';
> +    }
>    /* val and coreaddr are mutually exclusive, one of them *will* be zero */
>    if (val != 0)
>      {

Even easier: eliminate the copy entirely.  SYMBOL_SET_NAMES -> symbol_set_names
already does this and it never modifies its argument.

-- 
Daniel Jacobowitz
CodeSourcery