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, 2 insertions, 14 deletions

diff --git a/gdb/valprint.c b/gdb/valprint.c
index 9ea8d9c..0cdb23f 100644
--- a/gdb/valprint.c
+++ b/gdb/valprint.c
@@ -27,8 +27,7 @@
 #include "language.h"
 #include "annotate.h"
 #include "valprint.h"
-#include "doublest.h"
-#include "dfp.h"
+#include "target-float.h"
 #include "extension.h"
 #include "ada-lang.h"
 #include "gdb_obstack.h"
@@ -1366,18 +1365,7 @@ void
 print_floating (const gdb_byte *valaddr, struct type *type,
 		struct ui_file *stream)
 {
-  std::string str;
-  if (TYPE_CODE (type) == TYPE_CODE_FLT)
-    {
-      const struct floatformat *fmt = floatformat_from_type (type);
-      str = floatformat_to_string (fmt, valaddr);
-    }
-  else
-    {
-      enum bfd_endian byte_order = gdbarch_byte_order (get_type_arch (type));
-      unsigned len = TYPE_LENGTH (type);
-      str = decimal_to_string (valaddr, len, byte_order);
-    }
+  std::string str = target_float_to_string (valaddr, type);
   fputs_filtered (str.c_str (), stream);
 }