Initial Contribution

1 files changed, 68 insertions, 0 deletions

diff --git a/libdw/dwarf_formref.c b/libdw/dwarf_formref.c
new file mode 100644
index 00000000..d6b1f0f6
--- /dev/null
+++ b/libdw/dwarf_formref.c
@@ -0,0 +1,68 @@
+/* Return reference offset represented by attribute.
+   Copyright (C) 2003 Red Hat, Inc.
+   Written by Ulrich Drepper <drepper@redhat.com>, 2003.
+
+   This program is Open Source software; you can redistribute it and/or
+   modify it under the terms of the Open Software License version 1.0 as
+   published by the Open Source Initiative.
+
+   You should have received a copy of the Open Software License along
+   with this program; if not, you may obtain a copy of the Open Software
+   License version 1.0 from http://www.opensource.org/licenses/osl.php or
+   by writing the Open Source Initiative c/o Lawrence Rosen, Esq.,
+   3001 King Ranch Road, Ukiah, CA 95482.   */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <dwarf.h>
+#include "libdwP.h"
+
+
+int
+dwarf_formref (attr, return_offset)
+     Dwarf_Attribute *attr;
+     Dwarf_Off *return_offset;
+{
+  if (attr == NULL)
+    return -1;
+
+  unsigned int u128;
+  unsigned char *datap;
+
+  switch (attr->form)
+    {
+    case DW_FORM_ref1:
+      *return_offset = *attr->valp;
+      break;
+
+    case DW_FORM_ref2:
+      *return_offset = read_2ubyte_unaligned (attr->cu->dbg, attr->valp);
+      break;
+
+    case DW_FORM_ref4:
+      *return_offset = read_4ubyte_unaligned (attr->cu->dbg, attr->valp);
+      break;
+
+    case DW_FORM_ref8:
+      *return_offset = read_8ubyte_unaligned (attr->cu->dbg, attr->valp);
+      break;
+
+    case DW_FORM_ref_udata:
+      datap = attr->valp;
+      get_uleb128 (u128, datap);
+      *return_offset = u128;
+      break;
+
+    case DW_FORM_ref_addr:
+      __libdw_seterrno (DWARF_E_INVALID_REFERENCE);
+      return -1;
+
+    default:
+      __libdw_seterrno (DWARF_E_NO_REFERENCE);
+      return -1;
+    }
+
+  return 0;
+}