From 9b913628cfe092b3fdd328de4264def1ec1e94cb Mon Sep 17 00:00:00 2001
From: Thiago Jung Bauermann <bauerman@br.ibm.com>
Date: Thu, 25 Oct 2007 17:52:32 +0000
Subject: 2007-10-25  Wu Zhou  <woodzltc@cn.ibm.com> 	    Thiago Jung
 Bauermann  <bauerman@br.ibm.com>

	* Makefile.in (LIBDECNUMBER_DIR, LIBDECNUMBER, LIBDECNUMBER_SRC
	LIBDECNUMBER_CFLAGS): New macros for libdecnumber.
	(INTERNAL_CFLAGS_BASE): Add LIBDECNUMBER_CFLAGS in.
	(INSTALLED_LIBS): Add -ldecnumber in.
	(CLIBS): Add LIBDECNUMBER in.
	(decimal128_h, decimal64_h, decimal32_h): New macros for decimal
	headers.
	(dfp_h): New macros for decimal floating point.
	(dfp.o): New target.
	(COMMON_OBS): Add dfp.o in.
	(c-exp.o): Add dfp_h as dependency.
	(valprint.o): Add dfp_h as dependency.
	(value.o): Add dfp_h as dependency.
	* dfp.h: New header file for decimal floating point support in
	GDB.
	* dfp.c: New source file for decimal floating point support in
	GDB.  Implement decimal_from_string and decimal_to_string based
	on libdecnumber API.
	* configure.ac: Add AC_C_BIGENDIAN test.
	* config.in, configure: Regenerate.
---
 gdb/dfp.c | 113 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 113 insertions(+)
 create mode 100644 gdb/dfp.c

(limited to 'gdb/dfp.c')

diff --git a/gdb/dfp.c b/gdb/dfp.c
new file mode 100644
index 0000000..67cee13
--- /dev/null
+++ b/gdb/dfp.c
@@ -0,0 +1,113 @@
+/* Decimal floating point support for GDB.
+
+   Copyright 2007 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include "defs.h"
+
+/* The order of the following headers is important for making sure
+   decNumber structure is large enough to hold decimal128 digits.  */
+
+#include "dpd/decimal128.h"
+#include "dpd/decimal64.h"
+#include "dpd/decimal32.h"
+
+/* In GDB, we are using an array of gdb_byte to represent decimal values.
+   They are stored in host byte order.  This routine does the conversion if
+   the target byte order is different.  */
+static void
+match_endianness (const gdb_byte *from, int len, gdb_byte *to)
+{
+  int i;
+
+#if WORDS_BIGENDIAN
+#define OPPOSITE_BYTE_ORDER BFD_ENDIAN_LITTLE
+#else
+#define OPPOSITE_BYTE_ORDER BFD_ENDIAN_BIG
+#endif
+
+  if (gdbarch_byte_order (current_gdbarch) == OPPOSITE_BYTE_ORDER)
+    for (i = 0; i < len; i++)
+      to[i] = from[len - i - 1];
+  else
+    for (i = 0; i < len; i++)
+      to[i] = from[i];
+
+  return;
+}
+
+/* Convert decimal type to its string representation.  LEN is the length
+   of the decimal type, 4 bytes for decimal32, 8 bytes for decimal64 and
+   16 bytes for decimal128.  */
+void
+decimal_to_string (const gdb_byte *decbytes, int len, char *s)
+{
+  gdb_byte dec[16];
+
+  match_endianness (decbytes, len, dec);
+  switch (len)
+    {
+      case 4:
+	decimal32ToString ((decimal32 *) dec, s);
+	break;
+      case 8:
+	decimal64ToString ((decimal64 *) dec, s);
+	break;
+      case 16:
+	decimal128ToString ((decimal128 *) dec, s);
+	break;
+      default:
+	error (_("Unknown decimal floating point type.\n"));
+	break;
+    }
+}
+
+/* Convert the string form of a decimal value to its decimal representation.
+   LEN is the length of the decimal type, 4 bytes for decimal32, 8 bytes for
+   decimal64 and 16 bytes for decimal128.  */
+int
+decimal_from_string (gdb_byte *decbytes, int len, const char *string)
+{
+  decContext set;
+  gdb_byte dec[16];
+
+  switch (len)
+    {
+      case 4:
+	decContextDefault (&set, DEC_INIT_DECIMAL32);
+	set.traps = 0;
+	decimal32FromString ((decimal32 *) dec, string, &set);
+	break;
+      case 8:
+	decContextDefault (&set, DEC_INIT_DECIMAL64);
+	set.traps = 0;
+	decimal64FromString ((decimal64 *) dec, string, &set);
+	break;
+      case 16:
+	decContextDefault (&set, DEC_INIT_DECIMAL128);
+	set.traps = 0;
+	decimal128FromString ((decimal128 *) dec, string, &set);
+	break;
+      default:
+	error (_("Unknown decimal floating point type.\n"));
+	break;
+    }
+
+  match_endianness (dec, len, decbytes);
+
+  return 1;
+}
-- 
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