mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-27 04:52:05 +08:00
a154d838a7
I wrote this while debugging a problem where the expected unwinder for a
frame wasn't used. It adds messages to show which unwinders are
considered for a frame, why they are not selected (if an exception is
thrown), and finally which unwinder is selected in the end.
To be able to show a meaningful, human-readable name for the unwinders,
add a "name" field to struct frame_unwind, and update all instances to
include a name.
Here's an example of the output:
[frame] frame_unwind_find_by_frame: this_frame=0
[frame] frame_unwind_try_unwinder: trying unwinder "dummy"
[frame] frame_unwind_try_unwinder: no
[frame] frame_unwind_try_unwinder: trying unwinder "dwarf2 tailcall"
[frame] frame_unwind_try_unwinder: no
[frame] frame_unwind_try_unwinder: trying unwinder "inline"
[frame] frame_unwind_try_unwinder: no
[frame] frame_unwind_try_unwinder: trying unwinder "jit"
[frame] frame_unwind_try_unwinder: no
[frame] frame_unwind_try_unwinder: trying unwinder "python"
[frame] frame_unwind_try_unwinder: no
[frame] frame_unwind_try_unwinder: trying unwinder "amd64 epilogue"
[frame] frame_unwind_try_unwinder: no
[frame] frame_unwind_try_unwinder: trying unwinder "i386 epilogue"
[frame] frame_unwind_try_unwinder: no
[frame] frame_unwind_try_unwinder: trying unwinder "dwarf2"
[frame] frame_unwind_try_unwinder: yes
gdb/ChangeLog:
* frame-unwind.h (struct frame_unwind) <name>: New. Update
instances everywhere to include this field.
* frame-unwind.c (frame_unwind_try_unwinder,
frame_unwind_find_by_frame): Add debug messages.
Change-Id: I813f17777422425f0d08b22499817b23922e8ddb
92 lines
2.5 KiB
C
92 lines
2.5 KiB
C
/* Code dealing with register stack frames, for GDB, the GNU debugger.
|
|
|
|
Copyright (C) 1986-2021 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/>. */
|
|
|
|
|
|
#include "defs.h"
|
|
#include "regcache.h"
|
|
#include "sentinel-frame.h"
|
|
#include "inferior.h"
|
|
#include "frame-unwind.h"
|
|
|
|
struct frame_unwind_cache
|
|
{
|
|
struct regcache *regcache;
|
|
};
|
|
|
|
void *
|
|
sentinel_frame_cache (struct regcache *regcache)
|
|
{
|
|
struct frame_unwind_cache *cache =
|
|
FRAME_OBSTACK_ZALLOC (struct frame_unwind_cache);
|
|
|
|
cache->regcache = regcache;
|
|
return cache;
|
|
}
|
|
|
|
/* Here the register value is taken direct from the register cache. */
|
|
|
|
static struct value *
|
|
sentinel_frame_prev_register (struct frame_info *this_frame,
|
|
void **this_prologue_cache,
|
|
int regnum)
|
|
{
|
|
struct frame_unwind_cache *cache
|
|
= (struct frame_unwind_cache *) *this_prologue_cache;
|
|
struct value *value;
|
|
|
|
value = cache->regcache->cooked_read_value (regnum);
|
|
VALUE_NEXT_FRAME_ID (value) = sentinel_frame_id;
|
|
|
|
return value;
|
|
}
|
|
|
|
static void
|
|
sentinel_frame_this_id (struct frame_info *this_frame,
|
|
void **this_prologue_cache,
|
|
struct frame_id *this_id)
|
|
{
|
|
/* The sentinel frame is used as a starting point for creating the
|
|
previous (inner most) frame. That frame's THIS_ID method will be
|
|
called to determine the inner most frame's ID. Not this one. */
|
|
internal_error (__FILE__, __LINE__, _("sentinel_frame_this_id called"));
|
|
}
|
|
|
|
static struct gdbarch *
|
|
sentinel_frame_prev_arch (struct frame_info *this_frame,
|
|
void **this_prologue_cache)
|
|
{
|
|
struct frame_unwind_cache *cache
|
|
= (struct frame_unwind_cache *) *this_prologue_cache;
|
|
|
|
return cache->regcache->arch ();
|
|
}
|
|
|
|
const struct frame_unwind sentinel_frame_unwind =
|
|
{
|
|
"sentinel",
|
|
SENTINEL_FRAME,
|
|
default_frame_unwind_stop_reason,
|
|
sentinel_frame_this_id,
|
|
sentinel_frame_prev_register,
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
sentinel_frame_prev_arch,
|
|
};
|