rebase

From-SVN: r177571

1 files changed, 111 insertions, 0 deletions

diff --git a/gcc/data-streamer.c b/gcc/data-streamer.c
new file mode 100644
index 0000000..5eaacfc
--- /dev/null
+++ b/gcc/data-streamer.c
@@ -0,0 +1,111 @@
+/* Generic streaming support for basic data types.
+
+   Copyright 2011 Free Software Foundation, Inc.
+   Contributed by Diego Novillo <dnovillo@google.com>
+
+This file is part of GCC.
+
+GCC 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, or (at your option) any later
+version.
+
+GCC 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 GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "data-streamer.h"
+
+/* Pack WORK into BP in a variant of uleb format.  */
+
+void
+bp_pack_var_len_unsigned (struct bitpack_d *bp, unsigned HOST_WIDE_INT work)
+{
+  do
+    {
+      unsigned int half_byte = (work & 0x7);
+      work >>= 3;
+      if (work != 0)
+	/* More half_bytes to follow.  */
+	half_byte |= 0x8;
+
+      bp_pack_value (bp, half_byte, 4);
+    }
+  while (work != 0);
+}
+
+
+/* Pack WORK into BP in a variant of sleb format.  */
+
+void
+bp_pack_var_len_int (struct bitpack_d *bp, HOST_WIDE_INT work)
+{
+  int more, half_byte;
+
+  do
+    {
+      half_byte = (work & 0x7);
+      /* arithmetic shift */
+      work >>= 3;
+      more = !((work == 0 && (half_byte & 0x4) == 0)
+	       || (work == -1 && (half_byte & 0x4) != 0));
+      if (more)
+	half_byte |= 0x8;
+
+      bp_pack_value (bp, half_byte, 4);
+    }
+  while (more);
+}
+
+
+/* Unpack VAL from BP in a variant of uleb format.  */
+
+unsigned HOST_WIDE_INT
+bp_unpack_var_len_unsigned (struct bitpack_d *bp)
+{
+  unsigned HOST_WIDE_INT result = 0;
+  int shift = 0;
+  unsigned HOST_WIDE_INT half_byte;
+
+  while (true)
+    {
+      half_byte = bp_unpack_value (bp, 4);
+      result |= (half_byte & 0x7) << shift;
+      shift += 3;
+      if ((half_byte & 0x8) == 0)
+	return result;
+    }
+}
+
+
+/* Unpack VAL from BP in a variant of sleb format.  */
+
+HOST_WIDE_INT
+bp_unpack_var_len_int (struct bitpack_d *bp)
+{
+  HOST_WIDE_INT result = 0;
+  int shift = 0;
+  unsigned HOST_WIDE_INT half_byte;
+
+  while (true)
+    {
+      half_byte = bp_unpack_value (bp, 4);
+      result |= (half_byte & 0x7) << shift;
+      shift += 3;
+      if ((half_byte & 0x8) == 0)
+	{
+	  if ((shift < HOST_BITS_PER_WIDE_INT) && (half_byte & 0x4))
+	    result |= - ((HOST_WIDE_INT)1 << shift);
+
+	  return result;
+	}
+    }
+}