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/libdw_form.c b/libdw/libdw_form.c
new file mode 100644
index 0000000..72e2390
--- /dev/null
+++ b/libdw/libdw_form.c
@@ -0,0 +1,132 @@
+/* Helper functions for form handling.
+ Copyright (C) 2003-2009, 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 <string.h>
+
+#include "libdwP.h"
+
+
+size_t
+internal_function
+__libdw_form_val_compute_len (struct Dwarf_CU *cu, unsigned int form,
+ const unsigned char *valp)
+{
+ const unsigned char *startp = valp;
+ const unsigned char *endp = cu->endp;
+ Dwarf_Word u128;
+ size_t result;
+
+ /* NB: This doesn't cover constant form lengths, which are
+ already handled by the inlined __libdw_form_val_len. */
+ switch (form)
+ {
+ case DW_FORM_addr:
+ result = cu->address_size;
+ break;
+
+ case DW_FORM_ref_addr:
+ result = cu->version == 2 ? cu->address_size : cu->offset_size;
+ break;
+
+ case DW_FORM_strp:
+ case DW_FORM_sec_offset:
+ case DW_FORM_GNU_ref_alt:
+ case DW_FORM_GNU_strp_alt:
+ result = cu->offset_size;
+ break;
+
+ case DW_FORM_block1:
+ if (unlikely ((size_t) (endp - startp) < 1))
+ goto invalid;
+ result = *valp + 1;
+ break;
+
+ case DW_FORM_block2:
+ if (unlikely ((size_t) (endp - startp) < 2))
+ goto invalid;
+ result = read_2ubyte_unaligned (cu->dbg, valp) + 2;
+ break;
+
+ case DW_FORM_block4:
+ if (unlikely ((size_t) (endp - startp) < 4))
+ goto invalid;
+ result = read_4ubyte_unaligned (cu->dbg, valp) + 4;
+ break;
+
+ case DW_FORM_block:
+ case DW_FORM_exprloc:
+ get_uleb128 (u128, valp, endp);
+ result = u128 + (valp - startp);
+ break;
+
+ case DW_FORM_string:
+ {
+ const unsigned char *endstrp = memchr (valp, '\0',
+ (size_t) (endp - startp));
+ if (unlikely (endstrp == NULL))
+ goto invalid;
+ result = (size_t) (endstrp - startp) + 1;
+ break;
+ }
+
+ case DW_FORM_sdata:
+ case DW_FORM_udata:
+ case DW_FORM_ref_udata:
+ get_uleb128 (u128, valp, endp);
+ result = valp - startp;
+ break;
+
+ case DW_FORM_indirect:
+ get_uleb128 (u128, valp, endp);
+ // XXX Is this really correct?
+ result = __libdw_form_val_len (cu, u128, valp);
+ if (result != (size_t) -1)
+ result += valp - startp;
+ else
+ return (size_t) -1;
+ break;
+
+ default:
+ goto invalid;
+ }
+
+ if (unlikely (result > (size_t) (endp - startp)))
+ {
+ invalid:
+ __libdw_seterrno (DWARF_E_INVALID_DWARF);
+ result = (size_t) -1;
+ }
+
+ return result;
+}