Re: [rfc]: Replace current_gdbarch in sentinel-frame.c

[Markus Deuling <deuling at de dot ibm dot com>]

Ulrich Weigand schrieb:
> Thiago Jung Bauermann wrote:
> > On Fri, 2008-02-15 at 18:43 +0100, Ulrich Weigand wrote:
> > > This is not OK -- as the sentinel frame is always the innermost
> > > frame, next_frame will always be NULL here.
> > Actually, what I observe here when running GDB is that next_frame is the
> > sentinel frame, probably because sentinel frame's next field points back
> > to itself.
>
> Ah, right, I forgot about that.  Still, it seems best to try to get 
> rid of this hack completely ...

I tested *addrp = 0 on x86 and saw no regression. I changed the patch to remove
register_offset_hack completely.

Ok ?


ChangeLog:

	* sentinel-frame.c (sentinel_frame_prev_register): Do not call
	register_offset_hack anymore.

	* regcache.{c,h} (register_offset_hack): Remove.


Regards,
Markus

--
 Markus Deuling
 GNU Toolchain for Linux on Cell BE
 deuling@de.ibm.com

diff -urpN src/gdb/regcache.c dev/gdb/regcache.c
--- src/gdb/regcache.c	2008-01-01 23:53:12.000000000 +0100
+++ dev/gdb/regcache.c	2008-02-18 16:19:40.000000000 +0100
@@ -761,18 +761,6 @@ regcache_cooked_write_part (struct regca
 		      regcache_cooked_read, regcache_cooked_write);
 }
 
-/* Hack to keep code that view the register buffer as raw bytes
-   working.  */
-
-int
-register_offset_hack (struct gdbarch *gdbarch, int regnum)
-{
-  struct regcache_descr *descr = regcache_descr (gdbarch);
-  gdb_assert (regnum >= 0 && regnum < descr->nr_cooked_registers);
-  return descr->register_offset[regnum];
-}
-
-
 /* Supply register REGNUM, whose contents are stored in BUF, to REGCACHE.  */
 
 void
diff -urpN src/gdb/regcache.h dev/gdb/regcache.h
--- src/gdb/regcache.h	2008-01-01 23:53:12.000000000 +0100
+++ dev/gdb/regcache.h	2008-02-18 16:21:04.000000000 +0100
@@ -104,18 +104,6 @@ extern void regcache_raw_collect (const 
 				  int regnum, void *buf);
 
 
-/* The register's ``offset''.
-
-   FIXME: cagney/2002-11-07: The frame_register() function, when
-   specifying the real location of a register, does so using that
-   registers offset in the register cache.  That offset is then used
-   by valops.c to determine the location of the register.  The code
-   should instead use the register's number and a location expression
-   to describe a value spread across multiple registers or memory.  */
-
-extern int register_offset_hack (struct gdbarch *gdbarch, int regnum);
-
-
 /* The type of a register.  This function is slightly more efficient
    then its gdbarch vector counterpart since it returns a precomputed
    value stored in a table.  */
diff -urpN src/gdb/sentinel-frame.c dev/gdb/sentinel-frame.c
--- src/gdb/sentinel-frame.c	2008-01-01 23:53:12.000000000 +0100
+++ dev/gdb/sentinel-frame.c	2008-02-18 16:21:39.000000000 +0100
@@ -54,7 +54,7 @@ sentinel_frame_prev_register (struct fra
      onto the corresponding hardware register.  */
   *optimized = 0;
   *lvalp = lval_register;
-  *addrp = register_offset_hack (current_gdbarch, regnum);
+  *addrp = 0;
   *realnum = regnum;
 
   /* If needed, find and return the value of the register.  */