91 lines
2.5 KiB
C
91 lines
2.5 KiB
C
/* Code dealing with register stack frames, for GDB, the GNU debugger.
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Copyright (C) 1986-2018 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "regcache.h"
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#include "sentinel-frame.h"
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#include "inferior.h"
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#include "frame-unwind.h"
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struct frame_unwind_cache
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{
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struct regcache *regcache;
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};
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void *
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sentinel_frame_cache (struct regcache *regcache)
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{
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struct frame_unwind_cache *cache =
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FRAME_OBSTACK_ZALLOC (struct frame_unwind_cache);
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cache->regcache = regcache;
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return cache;
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}
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/* Here the register value is taken direct from the register cache. */
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static struct value *
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sentinel_frame_prev_register (struct frame_info *this_frame,
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void **this_prologue_cache,
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int regnum)
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{
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struct frame_unwind_cache *cache
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= (struct frame_unwind_cache *) *this_prologue_cache;
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struct value *value;
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value = regcache_cooked_read_value (cache->regcache, regnum);
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VALUE_NEXT_FRAME_ID (value) = sentinel_frame_id;
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return value;
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}
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static void
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sentinel_frame_this_id (struct frame_info *this_frame,
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void **this_prologue_cache,
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struct frame_id *this_id)
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{
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/* The sentinel frame is used as a starting point for creating the
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previous (inner most) frame. That frame's THIS_ID method will be
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called to determine the inner most frame's ID. Not this one. */
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internal_error (__FILE__, __LINE__, _("sentinel_frame_this_id called"));
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}
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static struct gdbarch *
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sentinel_frame_prev_arch (struct frame_info *this_frame,
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void **this_prologue_cache)
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{
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struct frame_unwind_cache *cache
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= (struct frame_unwind_cache *) *this_prologue_cache;
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return cache->regcache->arch ();
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}
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const struct frame_unwind sentinel_frame_unwind =
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{
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SENTINEL_FRAME,
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default_frame_unwind_stop_reason,
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sentinel_frame_this_id,
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sentinel_frame_prev_register,
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NULL,
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NULL,
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NULL,
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sentinel_frame_prev_arch,
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};
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