1 files changed, 81 insertions, 0 deletions
diff --git a/src/third_party/unwind/dist/src/mi/backtrace.c b/src/third_party/unwind/dist/src/mi/backtrace.c
new file mode 100644
index 00000000000..c7aa2bdcdcb
--- /dev/null
+++ b/src/third_party/unwind/dist/src/mi/backtrace.c
@@ -0,0 +1,81 @@
+/* libunwind - a platform-independent unwind library
+   Copyright (C) 2001-2002 Hewlett-Packard Co
+        Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
+
+This file is part of libunwind.
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
+
+#ifndef UNW_REMOTE_ONLY
+
+#define UNW_LOCAL_ONLY
+#include <libunwind.h>
+#include <libunwind_i.h>
+#include <string.h>
+
+/* See glibc manual for a description of this function.  */
+
+static ALWAYS_INLINE int
+slow_backtrace (void **buffer, int size, unw_context_t *uc)
+{
+  unw_cursor_t cursor;
+  unw_word_t ip;
+  int n = 0;
+
+  if (unlikely (unw_init_local (&cursor, uc) < 0))
+    return 0;
+
+  while (unw_step (&cursor) > 0)
+    {
+      if (n >= size)
+        return n;
+
+      if (unw_get_reg (&cursor, UNW_REG_IP, &ip) < 0)
+        return n;
+      buffer[n++] = (void *) (uintptr_t) ip;
+    }
+  return n;
+}
+
+int
+unw_backtrace (void **buffer, int size)
+{
+  unw_cursor_t cursor;
+  unw_context_t uc;
+  int n = size;
+
+  tdep_getcontext_trace (&uc);
+
+  if (unlikely (unw_init_local (&cursor, &uc) < 0))
+    return 0;
+
+  if (unlikely (tdep_trace (&cursor, buffer, &n) < 0))
+    {
+      unw_getcontext (&uc);
+      return slow_backtrace (buffer, size, &uc);
+    }
+
+  return n;
+}
+
+extern int backtrace (void **buffer, int size)
+  WEAK ALIAS(unw_backtrace);
+
+#endif /* !UNW_REMOTE_ONLY */