Squashed 'third_party/elfutils/' content from commit 555e15e
Change-Id: I61cde98949e47e5c8c09c33260de17f30921be79
git-subtree-dir: third_party/elfutils
git-subtree-split: 555e15ebe8bf1eb33d00747173cfc80cc65648a4
diff --git a/libdw/dwarf_formref.c b/libdw/dwarf_formref.c
new file mode 100644
index 0000000..2240a25
--- /dev/null
+++ b/libdw/dwarf_formref.c
@@ -0,0 +1,110 @@
+/* Return reference offset represented by attribute.
+ Copyright (C) 2003-2010, 2014 Red Hat, Inc.
+ This file is part of elfutils.
+ Written by Ulrich Drepper <drepper@redhat.com>, 2003.
+
+ This file is free software; you can redistribute it and/or modify
+ it under the terms of either
+
+ * the GNU Lesser General Public License as published by the Free
+ Software Foundation; either version 3 of the License, or (at
+ your option) any later version
+
+ or
+
+ * the GNU General Public License as published by the Free
+ Software Foundation; either version 2 of the License, or (at
+ your option) any later version
+
+ or both in parallel, as here.
+
+ elfutils 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 copies of the GNU General Public License and
+ the GNU Lesser General Public License along with this program. If
+ not, see <http://www.gnu.org/licenses/>. */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <dwarf.h>
+#include "libdwP.h"
+
+int
+internal_function
+__libdw_formref (Dwarf_Attribute *attr, Dwarf_Off *return_offset)
+{
+ const unsigned char *datap = attr->valp;
+ const unsigned char *endp = attr->cu->endp;
+
+ if (attr->valp == NULL)
+ {
+ __libdw_seterrno (DWARF_E_INVALID_REFERENCE);
+ return -1;
+ }
+
+ switch (attr->form)
+ {
+ case DW_FORM_ref1:
+ if (datap + 1 > endp)
+ {
+ invalid:
+ __libdw_seterrno (DWARF_E_INVALID_DWARF);
+ return -1;
+ }
+ *return_offset = *attr->valp;
+ break;
+
+ case DW_FORM_ref2:
+ if (datap + 2 > endp)
+ goto invalid;
+ *return_offset = read_2ubyte_unaligned (attr->cu->dbg, attr->valp);
+ break;
+
+ case DW_FORM_ref4:
+ if (datap + 4 > endp)
+ goto invalid;
+ *return_offset = read_4ubyte_unaligned (attr->cu->dbg, attr->valp);
+ break;
+
+ case DW_FORM_ref8:
+ if (datap + 8 > endp)
+ goto invalid;
+ *return_offset = read_8ubyte_unaligned (attr->cu->dbg, attr->valp);
+ break;
+
+ case DW_FORM_ref_udata:
+ if (datap + 1 > endp)
+ goto invalid;
+ get_uleb128 (*return_offset, datap, endp);
+ break;
+
+ case DW_FORM_ref_addr:
+ case DW_FORM_ref_sig8:
+ case DW_FORM_GNU_ref_alt:
+ /* These aren't handled by dwarf_formref, only by dwarf_formref_die. */
+ __libdw_seterrno (DWARF_E_INVALID_REFERENCE);
+ return -1;
+
+ default:
+ __libdw_seterrno (DWARF_E_NO_REFERENCE);
+ return -1;
+ }
+
+ return 0;
+}
+
+/* This is the old public entry point.
+ It is now deprecated in favor of dwarf_formref_die. */
+int
+dwarf_formref (Dwarf_Attribute *attr, Dwarf_Off *return_offset)
+{
+ if (attr == NULL)
+ return -1;
+
+ return __libdw_formref (attr, return_offset);
+}