obtained gcc-4.6.4.tar.bz2 from upstream website;upstream

verified gcc-4.6.4.tar.bz2.sig;
imported gcc-4.6.4 source tree from verified upstream tarball.

downloading a git-generated archive based on the 'upstream' tag
should provide you with a source tree that is binary identical
to the one extracted from the above tarball.

if you have obtained the source via the command 'git clone',
however, do note that line-endings of files in your working
directory might differ from line-endings of the respective
files in the upstream repository.

1 files changed, 126 insertions, 0 deletions

diff --git a/gcc/ada/tb-gcc.c b/gcc/ada/tb-gcc.c
new file mode 100644
index 000000000..22432b4e6
--- /dev/null
+++ b/gcc/ada/tb-gcc.c
@@ -0,0 +1,126 @@
+/****************************************************************************
+ *                                                                          *
+ *                         GNAT COMPILER COMPONENTS                         *
+ *                                                                          *
+ *                   T R A C E B A C K - G C C t a b l e s                  *
+ *                                                                          *
+ *                          C Implementation File                           *
+ *                                                                          *
+ *          Copyright (C) 2004-2009, Free Software Foundation, Inc.         *
+ *                                                                          *
+ * GNAT is free software;  you can  redistribute it  and/or modify it under *
+ * terms of the  GNU General Public License as published  by the Free Soft- *
+ * ware  Foundation;  either version 2,  or (at your option) any later ver- *
+ * sion.  GNAT is distributed in the hope that it will be useful, but WITH- *
+ * OUT 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  a copy of the GNU General *
+ * Public License  distributed with GNAT;  see file COPYING.  If not, write *
+ * to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, *
+ * Boston, MA 02110-1301, USA.                                              *
+ *                                                                          *
+ * As a  special  exception,  if you  link  this file  with other  files to *
+ * produce an executable,  this file does not by itself cause the resulting *
+ * executable to be covered by the GNU General Public License. This except- *
+ * ion does not  however invalidate  any other reasons  why the  executable *
+ * file might be covered by the  GNU Public License.                        *
+ *                                                                          *
+ * GNAT was originally developed  by the GNAT team at  New York University. *
+ * Extensive contributions were provided by Ada Core Technologies Inc.      *
+ *                                                                          *
+ ****************************************************************************/
+
+/* This is an implementation of the __gnat_backtrace routine using the
+   underlying GCC unwinding support associated with the exception handling
+   infrastructure.  This will only work for ZCX based applications.  */
+
+#include <unwind.h>
+
+/* The implementation boils down to a call to _Unwind_Backtrace with a
+   tailored callback and carried-on data structure to keep track of the
+   input parameters we got as well as of the basic processing state.  */
+
+/******************
+ * trace_callback *
+ ******************/
+
+#if !defined (__USING_SJLJ_EXCEPTIONS__)
+
+typedef struct {
+  void ** traceback;
+  int max_len;
+  void * exclude_min;
+  void * exclude_max;
+  int  n_frames_to_skip;
+  int  n_frames_skipped;
+  int  n_entries_filled;
+} uw_data_t;
+
+#if defined (__ia64__) && defined (__hpux__)
+#include <uwx.h>
+#endif
+
+static _Unwind_Reason_Code
+trace_callback (struct _Unwind_Context * uw_context, uw_data_t * uw_data)
+{
+  char * pc;
+
+#if defined (__ia64__) && defined (__hpux__)
+  /* Work around problem with _Unwind_GetIP on ia64 HP-UX. */
+  uwx_get_reg ((struct uwx_env *) uw_context, UWX_REG_IP, (uint64_t *) &pc);
+#else
+  pc = (char *) _Unwind_GetIP (uw_context);
+#endif
+
+  if (uw_data->n_frames_skipped < uw_data->n_frames_to_skip)
+    {
+      uw_data->n_frames_skipped ++;
+      return _URC_NO_REASON;
+    }
+
+  if (uw_data->n_entries_filled >= uw_data->max_len)
+    return _URC_NORMAL_STOP;
+
+  if (pc < (char *)uw_data->exclude_min || pc > (char *)uw_data->exclude_max)
+    uw_data->traceback [uw_data->n_entries_filled ++] = pc + PC_ADJUST;
+
+  return _URC_NO_REASON;
+}
+
+#endif
+
+/********************
+ * __gnat_backtrace *
+ ********************/
+
+int
+__gnat_backtrace (void ** traceback __attribute__((unused)),
+		  int max_len __attribute__((unused)),
+		  void * exclude_min __attribute__((unused)),
+		  void * exclude_max __attribute__((unused)),
+		  int skip_frames __attribute__((unused)))
+{
+#if defined (__USING_SJLJ_EXCEPTIONS__)
+  /* We have no unwind material (tables) at hand with sjlj eh, and no
+     way to retrieve complete and accurate call chain information from
+     the context stack we maintain.  */
+  return 0;
+#else
+  uw_data_t uw_data;
+  /* State carried over during the whole unwinding process.  */
+
+  uw_data.traceback   = traceback;
+  uw_data.max_len     = max_len;
+  uw_data.exclude_min = exclude_min;
+  uw_data.exclude_max = exclude_max;
+
+  uw_data.n_frames_to_skip = skip_frames;
+
+  uw_data.n_frames_skipped = 0;
+  uw_data.n_entries_filled = 0;
+
+  _Unwind_Backtrace ((_Unwind_Trace_Fn)trace_callback, &uw_data);
+
+  return uw_data.n_entries_filled;
+#endif
+}