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_formblock.c b/libdw/dwarf_formblock.c
new file mode 100644
index 0000000..13f9e72
--- /dev/null
+++ b/libdw/dwarf_formblock.c
@@ -0,0 +1,93 @@
+/* Return block represented by attribute.
+ Copyright (C) 2004-2010, 2014 Red Hat, Inc.
+ This file is part of elfutils.
+ Written by Ulrich Drepper <drepper@redhat.com>, 2004.
+
+ 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
+dwarf_formblock (Dwarf_Attribute *attr, Dwarf_Block *return_block)
+{
+ if (attr == NULL)
+ return -1;
+
+ const unsigned char *datap = attr->valp;
+ const unsigned char *endp = attr->cu->endp;
+
+ switch (attr->form)
+ {
+ case DW_FORM_block1:
+ if (unlikely (endp - datap < 1))
+ goto invalid;
+ return_block->length = *(uint8_t *) attr->valp;
+ return_block->data = attr->valp + 1;
+ break;
+
+ case DW_FORM_block2:
+ if (unlikely (endp - datap < 2))
+ goto invalid;
+ return_block->length = read_2ubyte_unaligned (attr->cu->dbg, attr->valp);
+ return_block->data = attr->valp + 2;
+ break;
+
+ case DW_FORM_block4:
+ if (unlikely (endp - datap < 4))
+ goto invalid;
+ return_block->length = read_4ubyte_unaligned (attr->cu->dbg, attr->valp);
+ return_block->data = attr->valp + 4;
+ break;
+
+ case DW_FORM_block:
+ case DW_FORM_exprloc:
+ if (unlikely (endp - datap < 1))
+ goto invalid;
+ get_uleb128 (return_block->length, datap, endp);
+ return_block->data = (unsigned char *) datap;
+ break;
+
+ default:
+ __libdw_seterrno (DWARF_E_NO_BLOCK);
+ return -1;
+ }
+
+ if (unlikely (return_block->length > (size_t) (endp - return_block->data)))
+ {
+ /* Block does not fit. */
+ invalid:
+ __libdw_seterrno (DWARF_E_INVALID_DWARF);
+ return -1;
+ }
+
+ return 0;
+}
+INTDEF(dwarf_formblock)