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_frame_cfa.c b/libdw/dwarf_frame_cfa.c
new file mode 100644
index 0000000..07f998c
--- /dev/null
+++ b/libdw/dwarf_frame_cfa.c
@@ -0,0 +1,77 @@
+/* Get CFA expression for frame.
+ Copyright (C) 2009-2010 Red Hat, Inc.
+ This file is part of elfutils.
+
+ 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 "cfi.h"
+#include <dwarf.h>
+#include <stdlib.h>
+
+int
+dwarf_frame_cfa (Dwarf_Frame *fs, Dwarf_Op **ops, size_t *nops)
+{
+ /* Maybe there was a previous error. */
+ if (fs == NULL)
+ return -1;
+
+ int result = 0;
+ switch (fs->cfa_rule)
+ {
+ case cfa_undefined:
+ *ops = NULL;
+ *nops = 0;
+ break;
+
+ case cfa_offset:
+ /* The Dwarf_Op was already fully initialized by execute_cfi. */
+ *ops = &fs->cfa_data.offset;
+ *nops = 1;
+ break;
+
+ case cfa_expr:
+ /* Parse the expression into internal form. */
+ result = __libdw_intern_expression
+ (NULL, fs->cache->other_byte_order,
+ fs->cache->e_ident[EI_CLASS] == ELFCLASS32 ? 4 : 8, 4,
+ &fs->cache->expr_tree, &fs->cfa_data.expr, false, false,
+ ops, nops, IDX_debug_frame);
+ break;
+
+ case cfa_invalid:
+ __libdw_seterrno (DWARF_E_INVALID_CFI);
+ result = -1;
+ break;
+
+ default:
+ abort ();
+ }
+
+ return result;
+}