Make a few simplifications in these functions.
1. When checking if we need to do nothing, if the length is 0, we don't
need to do anything, regardless of the value of offset. Remove the
offset check.
2. When check if transferring the whole register, if the length is equal
to the register size, then we transfer the whole register, no need to
check the offset. Remove the offset check.
3. In the gdb_asserts, it is unnecessary to check for:
offset <= reg_size
given that right after we check for:
len >= 0 && offset + len <= reg_size
If `offset + len` is <= reg_size and len is >= 0, then necessarily
offset is <= reg_size. Remove the `offset <= reg_size` check.
Change-Id: I30a73acdc7bf432c45a07f5f177224d1cdc298e8
Reviewed-By: John Baldwin <jhb@FreeBSD.org>
---
gdb/regcache.c | 24 ++++++++++++------------
1 file changed, 12 insertions(+), 12 deletions(-)
@@ -873,16 +873,16 @@ readable_regcache::read_part (int regnum, int offset, int len,
int reg_size = register_size (arch (), regnum);
gdb_assert (out != NULL);
- gdb_assert (offset >= 0 && offset <= reg_size);
+ gdb_assert (offset >= 0);
gdb_assert (len >= 0 && offset + len <= reg_size);
- if (offset == 0 && len == 0)
+ if (len == 0)
{
/* Nothing to do. */
return REG_VALID;
}
- if (offset == 0 && len == reg_size)
+ if (len == reg_size)
{
/* Read the full register. */
return (is_raw) ? raw_read (regnum, out) : cooked_read (regnum, out);
@@ -910,16 +910,16 @@ reg_buffer::raw_collect_part (int regnum, int offset, int len,
int reg_size = register_size (arch (), regnum);
gdb_assert (out != nullptr);
- gdb_assert (offset >= 0 && offset <= reg_size);
+ gdb_assert (offset >= 0);
gdb_assert (len >= 0 && offset + len <= reg_size);
- if (offset == 0 && len == 0)
+ if (len == 0)
{
/* Nothing to do. */
return;
}
- if (offset == 0 && len == reg_size)
+ if (len == reg_size)
{
/* Collect the full register. */
return raw_collect (regnum, out);
@@ -940,16 +940,16 @@ regcache::write_part (int regnum, int offset, int len,
int reg_size = register_size (arch (), regnum);
gdb_assert (in != NULL);
- gdb_assert (offset >= 0 && offset <= reg_size);
+ gdb_assert (offset >= 0);
gdb_assert (len >= 0 && offset + len <= reg_size);
- if (offset == 0 && len == 0)
+ if (len == 0)
{
/* Nothing to do. */
return REG_VALID;
}
- if (offset == 0 && len == reg_size)
+ if (len == reg_size)
{
/* Write the full register. */
(is_raw) ? raw_write (regnum, in) : cooked_write (regnum, in);
@@ -979,16 +979,16 @@ reg_buffer::raw_supply_part (int regnum, int offset, int len,
int reg_size = register_size (arch (), regnum);
gdb_assert (in != nullptr);
- gdb_assert (offset >= 0 && offset <= reg_size);
+ gdb_assert (offset >= 0);
gdb_assert (len >= 0 && offset + len <= reg_size);
- if (offset == 0 && len == 0)
+ if (len == 0)
{
/* Nothing to do. */
return;
}
- if (offset == 0 && len == reg_size)
+ if (len == reg_size)
{
/* Supply the full register. */
return raw_supply (regnum, in);