Target FP: Add string routines to target-float.{c,h}

This adds target_float_to_string and target_float_from_string,
which dispatch to the corresponding floatformat_ or decimal_ routines.

Existing users of those routines are changed to use the new
target-float routines instead (most of those places already handle
both binary and decimal FP).

In addition, two other places are changes to use target_float_from_string:

- define_symbol in stabsread.c, when parsing a floating-point literal
  from stabs debug info

- gdbarch-selftest.c when initializing a target format values (to
  eliminate use of DOUBLEST there).

gdb/ChangeLog:
2017-11-06  Ulrich Weigand  <uweigand@de.ibm.com>

	* target-float.c (target_float_to_string): New function.
	(target_float_from_string): New function.
	* target-float.h (target_float_to_string): Add prototype.
	(target_float_from_string): Add prototype.

	* valprint.c: Include "target-float.h".  Do not include
	"doublest.h" and "dfp.h".
	(print_floating): Use target_float_to_string.
	* printcmd.c: Include "target-float.h".  Do not include "dfp.h".
	(printf_floating): Use target_float_to_string.
	* i387-tdep.c: Include "target-float.h".  Do not include "doublest.h".
	(print_i387_value): Use target_float_to_string.
	* mips-tdep.c: Include "target-float.h".
	(mips_print_fp_register): Use target_float_to_string.
	* sh64-tdep.c: Include "target-float.h".
	(sh64_do_fp_register): Use target_float_to_string.

	* parse.c: Include "target-float.h".  Do not include
	"doublest.h" and "dfp.h".
	(parse_float): Use target_float_from_string.
	* stabsread.c: Include "target-float.h".  Do not include "doublest.h".
	(define_symbol): Use target_float_from_string.
	* gdbarch-selftests.c: Include "target-float.h".
	(register_to_value_test): Use target_float_from_string.

1 files changed, 3 insertions, 4 deletions

diff --git a/gdb/i387-tdep.c b/gdb/i387-tdep.c
index cfacced..8de0431 100644
--- a/gdb/i387-tdep.c
+++ b/gdb/i387-tdep.c
@@ -18,12 +18,12 @@
    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #include "defs.h"
-#include "doublest.h"
 #include "frame.h"
 #include "gdbcore.h"
 #include "inferior.h"
 #include "language.h"
 #include "regcache.h"
+#include "target-float.h"
 #include "value.h"
 
 #include "i386-tdep.h"
@@ -40,9 +40,8 @@ print_i387_value (struct gdbarch *gdbarch,
      garbage, but we'd better print one too many.  We need enough room
      to print the value, 1 position for the sign, 1 for the decimal
      point, 19 for the digits and 6 for the exponent adds up to 27.  */
-  const struct floatformat *fmt
-    = floatformat_from_type (i387_ext_type (gdbarch));
-  std::string str = floatformat_to_string (fmt, raw, " %-+27.19g");
+  const struct type *type = i387_ext_type (gdbarch);
+  std::string str = target_float_to_string (raw, type, " %-+27.19g");
   fprintf_filtered (file, "%s", str.c_str ());
 }