/* Definitions for a frame unwinder, for GDB, the GNU debugger.
- Copyright (C) 2003, 2004, 2007, 2008, 2009, 2010, 2011
- Free Software Foundation, Inc.
+ Copyright (C) 2003-2015 Free Software Foundation, Inc.
This file is part of GDB.
/* Given THIS frame, take a whiff of its registers (namely
the PC and attributes) and if SELF is the applicable unwinder,
- return non-zero. Possibly also initialize THIS_PROLOGUE_CACHE. */
+ return non-zero. Possibly also initialize THIS_PROLOGUE_CACHE; but
+ only if returning 1. Initializing THIS_PROLOGUE_CACHE in other
+ cases (0 return, or exception) is invalid. */
typedef int (frame_sniffer_ftype) (const struct frame_unwind *self,
struct frame_info *this_frame,