Merge GDB 7.5.1

gdb/dwarf2-frame-tailcall.c

 /* Virtual tail call frames unwinder for GDB.
 
    Copyright (C) 2010-2012 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.
@@ skipping 218 matching lines @@
 }
 
 /* Find PC to be unwound from THIS_FRAME.  THIS_FRAME must be a part of
    CACHE.  */
 
 static CORE_ADDR
 pretend_pc (struct frame_info *this_frame, struct tailcall_cache *cache)
 {
   int next_levels = existing_next_levels (this_frame, cache);
   struct call_site_chain *chain = cache->chain;
-  int caller_no;
 
   gdb_assert (chain != NULL);
 
   next_levels++;
   gdb_assert (next_levels >= 0);
 
   if (next_levels < chain->callees)
     return chain->call_site[chain->length - next_levels - 1]->pc;
   next_levels -= chain->callees;
 
@@ skipping 110 matching lines @@
    call frames frame base to get the SP value there - to simulate return
    address pushed on the stack.  */
 
 void
 dwarf2_tailcall_sniffer_first (struct frame_info *this_frame,
                                void **tailcall_cachep,
                                const LONGEST *entry_cfa_sp_offsetp)
 {
   CORE_ADDR prev_pc = 0, prev_sp = 0;   /* GCC warning.  */
   int prev_sp_p = 0;
-  CORE_ADDR this_pc, pc;
+  CORE_ADDR this_pc;
   struct gdbarch *prev_gdbarch;
   struct call_site_chain *chain = NULL;
-  struct frame_info *fi;
   struct tailcall_cache *cache;
   volatile struct gdb_exception except;
 
   gdb_assert (*tailcall_cachep == NULL);
 
   this_pc = get_frame_pc (this_frame);
 
   /* Catch any unwinding errors.  */
   TRY_CATCH (except, RETURN_MASK_ERROR)
     {
@@ skipping 84 matching lines @@
 
 /* Provide a prototype to silence -Wmissing-prototypes.  */
 extern initialize_file_ftype _initialize_tailcall_frame;
 
 void
 _initialize_tailcall_frame (void)
 {
   cache_htab = htab_create_alloc (50, cache_hash, cache_eq, NULL, xcalloc,
                                   xfree);
 }