Move unwind reasons to an external .def file

gdb/
	* frame.c (frame_stop_reason_string): Rewrite using
	unwind_stop_reasons.def.
	* frame.h (enum unwind_stop_reason): Likewise.
	* python/py-frame.c (gdbpy_initialize_frames): Likewise.
	(gdbpy_frame_stop_reason_string): Use new enum unwind_stop_reason
	constants for bound-checking.
	* unwind_stop_reasons.def: New file.
	* stack.c (backtrace_command_1): Handle UNWIND_FIRST_ERROR as an alias
	instead of a distinct value.

doc/
	* gdb.texinfo ((Frames In Python): Document
	gdb.FRAME_UNWIND_FIRST_ERROR contant.

1 files changed, 80 insertions, 0 deletions

diff --git a/gdb/unwind_stop_reasons.def b/gdb/unwind_stop_reasons.def
new file mode 100644
index 0000000..9a34feb
--- /dev/null
+++ b/gdb/unwind_stop_reasons.def
@@ -0,0 +1,80 @@
+/* Copyright 2011 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program 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 a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+/* Reasons why frames could not be further unwound
+   SET (name, description)
+  
+   After this reason name, all reasons should be considered errors;
+   i.e.: abnormal stack termination.
+   FIRST_ERROR (name)  
+   
+   First and Last reason defined
+   FIRST_ENTRY (name)
+   LAST_ENTRY (name)  */
+
+#ifdef SET
+/* No particular reason; either we haven't tried unwinding yet, 
+   or we didn't fail.  */
+SET (UNWIND_NO_REASON, "no reason")
+
+/* The previous frame's analyzer returns an invalid result
+   from this_id.
+
+   FIXME drow/2006-08-16: This is how GDB used to indicate end of
+   stack.  We should migrate to a model where frames always have a
+   valid ID, and this becomes not just an error but an internal
+   error.  But that's a project for another day.  */
+SET (UNWIND_NULL_ID, "unwinder did not report frame ID")
+
+/* This frame is the outermost.  */
+SET (UNWIND_OUTERMOST, "outermost")
+
+/* Can't unwind further, because that would require knowing the
+   values of registers or memory that haven't been collected.  */
+SET (UNWIND_UNAVAILABLE, \
+     "not enough registers or memory available to unwind further")
+
+/* This frame ID looks like it ought to belong to a NEXT frame,
+   but we got it for a PREV frame.  Normally, this is a sign of
+   unwinder failure.  It could also indicate stack corruption.  */
+SET (UNWIND_INNER_ID, "previous frame inner to this frame (corrupt stack?)")
+
+/* This frame has the same ID as the previous one.  That means
+   that unwinding further would almost certainly give us another
+   frame with exactly the same ID, so break the chain.  Normally,
+   this is a sign of unwinder failure.  It could also indicate
+   stack corruption.  */
+SET (UNWIND_SAME_ID, "previous frame identical to this frame (corrupt stack?)")
+
+/* The frame unwinder didn't find any saved PC, but we needed
+   one to unwind further.  */
+SET (UNWIND_NO_SAVED_PC, "frame did not save the PC")
+
+#endif /* SET */
+
+
+#ifdef FIRST_ERROR
+FIRST_ERROR (UNWIND_UNAVAILABLE)
+#endif
+
+#ifdef FIRST_ENTRY
+FIRST_ENTRY (UNWIND_NO_REASON)
+#endif
+
+#ifdef LAST_ENTRY
+LAST_ENTRY (UNWIND_NO_SAVED_PC)
+#endif