[gdb] Improve printing of float formats

Currently, on x86_64, a little endian target, I get:
...
$ gdb -q -batch -ex "maint print architecture" | grep " = floatformat"
gdbarch_dump: bfloat16_format = floatformat_bfloat16_big
gdbarch_dump: double_format = floatformat_ieee_double_big
gdbarch_dump: float_format = floatformat_ieee_single_big
gdbarch_dump: half_format = floatformat_ieee_half_big
gdbarch_dump: long_double_format = floatformat_i387_ext
...
which suggests big endian.

This is due to this bit of code in pformat:
...
    /* Just print out one of them - this is only for diagnostics.  */
    return format[0]->name;
...

Fix this by using gdbarch_byte_order to pick the appropriate index, such that
we have the more accurate:
...
gdbarch_dump: bfloat16_format = floatformat_bfloat16_little
gdbarch_dump: half_format = floatformat_ieee_half_little
gdbarch_dump: float_format = floatformat_ieee_single_little
gdbarch_dump: double_format = floatformat_ieee_double_little
gdbarch_dump: long_double_format = floatformat_i387_ext
...

Tested on x86_64-linux.

1 files changed, 5 insertions, 5 deletions

diff --git a/gdb/gdbarch.c b/gdb/gdbarch.c
index 3227e94..ddb8dec 100644
--- a/gdb/gdbarch.c
+++ b/gdb/gdbarch.c
@@ -565,31 +565,31 @@ gdbarch_dump (struct gdbarch *gdbarch, struct ui_file *file)
                       plongest (gdbarch->bfloat16_bit));
   gdb_printf (file,
                       "gdbarch_dump: bfloat16_format = %s\n",
-                      pformat (gdbarch->bfloat16_format));
+                      pformat (gdbarch, gdbarch->bfloat16_format));
   gdb_printf (file,
                       "gdbarch_dump: half_bit = %s\n",
                       plongest (gdbarch->half_bit));
   gdb_printf (file,
                       "gdbarch_dump: half_format = %s\n",
-                      pformat (gdbarch->half_format));
+                      pformat (gdbarch, gdbarch->half_format));
   gdb_printf (file,
                       "gdbarch_dump: float_bit = %s\n",
                       plongest (gdbarch->float_bit));
   gdb_printf (file,
                       "gdbarch_dump: float_format = %s\n",
-                      pformat (gdbarch->float_format));
+                      pformat (gdbarch, gdbarch->float_format));
   gdb_printf (file,
                       "gdbarch_dump: double_bit = %s\n",
                       plongest (gdbarch->double_bit));
   gdb_printf (file,
                       "gdbarch_dump: double_format = %s\n",
-                      pformat (gdbarch->double_format));
+                      pformat (gdbarch, gdbarch->double_format));
   gdb_printf (file,
                       "gdbarch_dump: long_double_bit = %s\n",
                       plongest (gdbarch->long_double_bit));
   gdb_printf (file,
                       "gdbarch_dump: long_double_format = %s\n",
-                      pformat (gdbarch->long_double_format));
+                      pformat (gdbarch, gdbarch->long_double_format));
   gdb_printf (file,
                       "gdbarch_dump: wchar_bit = %s\n",
                       plongest (gdbarch->wchar_bit));