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2002-11-06 Andrew Cagney <ac131313@redhat.com> 

* valops.c (value_assign): Merge lval_register case into
	lval_reg_frame_relative.  Use frame_register and
	regcache_cooked_write instead of get_saved_register and
	write_register_bytes.  After flushing the register cache, try to
	re-select the selected frame.
jimb-separate-debug-021125-branch
Andrew Cagney 24 years ago
parent
8262ee2317
commit
492254e9db
2 changed files with 112 additions and 95 deletions
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  1. 8
      gdb/ChangeLog
  2. 171
      gdb/valops.c

8
gdb/ChangeLog
View File

@ -1,3 +1,11 @@
2002-11-06 Andrew Cagney <ac131313@redhat.com>
* valops.c (value_assign): Merge lval_register case into
lval_reg_frame_relative. Use frame_register and
regcache_cooked_write instead of get_saved_register and
write_register_bytes. After flushing the register cache, try to
re-select the selected frame.
2002-11-06 Andrew Cagney <ac131313@redhat.com>
* regcache.h (deprecated_register_valid): Rename register_valid.

171
gdb/valops.c
View File

@ -630,132 +630,120 @@ value_assign (struct value *toval, struct value *fromval)
}
break;
case lval_register:
if (VALUE_BITSIZE (toval))
{
char buffer[sizeof (LONGEST)];
int len =
REGISTER_RAW_SIZE (VALUE_REGNO (toval)) - VALUE_OFFSET (toval);
if (len > (int) sizeof (LONGEST))
error ("Can't handle bitfields in registers larger than %d bits.",
(int) sizeof (LONGEST) * HOST_CHAR_BIT);
if (VALUE_BITPOS (toval) + VALUE_BITSIZE (toval)
> len * HOST_CHAR_BIT)
/* Getting this right would involve being very careful about
byte order. */
error ("Can't assign to bitfields that cross register "
"boundaries.");
read_register_bytes (VALUE_ADDRESS (toval) + VALUE_OFFSET (toval),
buffer, len);
modify_field (buffer, value_as_long (fromval),
VALUE_BITPOS (toval), VALUE_BITSIZE (toval));
write_register_bytes (VALUE_ADDRESS (toval) + VALUE_OFFSET (toval),
buffer, len);
}
else if (use_buffer)
write_register_bytes (VALUE_ADDRESS (toval) + VALUE_OFFSET (toval),
raw_buffer, use_buffer);
else
{
/* Do any conversion necessary when storing this type to more
than one register. */
#ifdef REGISTER_CONVERT_FROM_TYPE
memcpy (raw_buffer, VALUE_CONTENTS (fromval), TYPE_LENGTH (type));
REGISTER_CONVERT_FROM_TYPE (VALUE_REGNO (toval), type, raw_buffer);
write_register_bytes (VALUE_ADDRESS (toval) + VALUE_OFFSET (toval),
raw_buffer, TYPE_LENGTH (type));
#else
write_register_bytes (VALUE_ADDRESS (toval) + VALUE_OFFSET (toval),
VALUE_CONTENTS (fromval), TYPE_LENGTH (type));
#endif
}
target_changed_event ();
/* Assigning to the stack pointer, frame pointer, and other
(architecture and calling convention specific) registers may
cause the frame cache to be out of date. We just do this
on all assignments to registers for simplicity; I doubt the slowdown
matters. */
reinit_frame_cache ();
break;
case lval_reg_frame_relative:
case lval_register:
{
struct frame_id old_frame;
/* value is stored in a series of registers in the frame
specified by the structure. Copy that value out, modify
it, and copy it back in. */
int amount_to_copy = (VALUE_BITSIZE (toval) ? 1 : TYPE_LENGTH (type));
int reg_size = REGISTER_RAW_SIZE (VALUE_FRAME_REGNUM (toval));
int byte_offset = VALUE_OFFSET (toval) % reg_size;
int reg_offset = VALUE_OFFSET (toval) / reg_size;
int amount_copied;
/* Make the buffer large enough in all cases. */
/* FIXME (alloca): Not safe for very large data types. */
char *buffer = (char *) alloca (amount_to_copy
+ sizeof (LONGEST)
+ MAX_REGISTER_RAW_SIZE);
int amount_to_copy;
char *buffer;
int value_reg;
int reg_offset;
int byte_offset;
int regno;
struct frame_info *frame;
/* Since modifying a register can trash the frame chain, we
save the old frame and then restore the new frame
afterwards. */
get_frame_id (selected_frame, &old_frame);
/* Figure out which frame this is in currently. */
if (VALUE_LVAL (toval) == lval_register)
{
frame = get_current_frame ();
value_reg = VALUE_REGNO (toval);
}
else
{
for (frame = get_current_frame ();
frame && FRAME_FP (frame) != VALUE_FRAME (toval);
frame = get_prev_frame (frame))
;
value_reg = VALUE_FRAME_REGNUM (toval);
}
if (!frame)
error ("Value being assigned to is no longer active.");
amount_to_copy += (reg_size - amount_to_copy % reg_size);
/* Locate the first register that falls in the value that
needs to be transfered. Compute the offset of the value in
that register. */
{
int offset;
for (reg_offset = value_reg, offset = 0;
offset + REGISTER_RAW_SIZE (reg_offset) <= VALUE_OFFSET (toval);
reg_offset++);
byte_offset = VALUE_OFFSET (toval) - offset;
}
/* Copy it out. */
for ((regno = VALUE_FRAME_REGNUM (toval) + reg_offset,
amount_copied = 0);
/* Compute the number of register aligned values that need to
be copied. */
if (VALUE_BITSIZE (toval))
amount_to_copy = byte_offset + 1;
else
amount_to_copy = byte_offset + TYPE_LENGTH (type);
/* And a bounce buffer. Be slightly over generous. */
buffer = (char *) alloca (amount_to_copy
+ MAX_REGISTER_RAW_SIZE);
/* Copy it in. */
for (regno = reg_offset, amount_copied = 0;
amount_copied < amount_to_copy;
amount_copied += reg_size, regno++)
amount_copied += REGISTER_RAW_SIZE (regno), regno++)
{
get_saved_register (buffer + amount_copied,
(int *) NULL, (CORE_ADDR *) NULL,
frame, regno, (enum lval_type *) NULL);
frame_register_read (frame, regno, buffer + amount_copied);
}
/* Modify what needs to be modified. */
if (VALUE_BITSIZE (toval))
{
modify_field (buffer + byte_offset,
value_as_long (fromval),
VALUE_BITPOS (toval), VALUE_BITSIZE (toval));
}
else if (use_buffer)
memcpy (buffer + byte_offset, raw_buffer, use_buffer);
{
memcpy (buffer + VALUE_OFFSET (toval), raw_buffer, use_buffer);
}
else
{
memcpy (buffer + byte_offset, VALUE_CONTENTS (fromval),
TYPE_LENGTH (type));
/* Do any conversion necessary when storing this type to
more than one register. */
#ifdef REGISTER_CONVERT_FROM_TYPE
REGISTER_CONVERT_FROM_TYPE (value_reg, type,
(buffer + byte_offset));
#endif
}
/* Copy it back. */
for ((regno = VALUE_FRAME_REGNUM (toval) + reg_offset,
amount_copied = 0);
/* Copy it out. */
for (regno = reg_offset, amount_copied = 0;
amount_copied < amount_to_copy;
amount_copied += reg_size, regno++)
amount_copied += REGISTER_RAW_SIZE (regno), regno++)
{
enum lval_type lval;
CORE_ADDR addr;
int optim;
int realnum;
/* Just find out where to put it. */
get_saved_register ((char *) NULL,
&optim, &addr, frame, regno, &lval);
frame_register (frame, regno, &optim, &lval, &addr, &realnum,
NULL);
if (optim)
error ("Attempt to assign to a value that was optimized out.");
if (lval == lval_memory)
write_memory (addr, buffer + amount_copied, reg_size);
write_memory (addr, buffer + amount_copied,
REGISTER_RAW_SIZE (regno));
else if (lval == lval_register)
write_register_bytes (addr, buffer + amount_copied, reg_size);
regcache_cooked_write (current_regcache, realnum,
(buffer + amount_copied));
else
error ("Attempt to assign to an unmodifiable value.");
}
@ -763,6 +751,27 @@ value_assign (struct value *toval, struct value *fromval)
if (register_changed_hook)
register_changed_hook (-1);
target_changed_event ();
/* Assigning to the stack pointer, frame pointer, and other
(architecture and calling convention specific) registers
may cause the frame cache to be out of date. We just do
this on all assignments to registers for simplicity; I
doubt the slowdown matters. */
reinit_frame_cache ();
/* Having destoroyed the frame cache, restore the selected
frame. */
/* FIXME: cagney/2002-11-02: There has to be a better way of
doing this. Instead of constantly saving/restoring the
frame. Why not create a get_selected_frame() function
that, having saved the selected frame's ID can
automatically re-find the previously selected frame
automatically. */
{
struct frame_info *fi = frame_find_by_id (old_frame);
if (fi != NULL)
select_frame (fi);
}
}
break;

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