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/tmp/gdb-8.1/gdb/sentinel-frame.c
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1 /* Code dealing with register stack frames, for GDB, the GNU debugger.
2
3 Copyright (C) 1986-2018 Free Software Foundation, Inc.
4
5 This file is part of GDB.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
19
20
21 #include "defs.h"
22 #include "regcache.h"
23 #include "sentinel-frame.h"
24 #include "inferior.h"
25 #include "frame-unwind.h"
26
27 struct frame_unwind_cache
28 {
29 struct regcache *regcache;
30 };
31
32 void *
33 sentinel_frame_cache (struct regcache *regcache)
34 {
35 struct frame_unwind_cache *cache =
36 FRAME_OBSTACK_ZALLOC (struct frame_unwind_cache);
37
38 cache->regcache = regcache;
39 return cache;
40 }
41
42 /* Here the register value is taken direct from the register cache. */
43
44 static struct value *
45 sentinel_frame_prev_register (struct frame_info *this_frame,
46 void **this_prologue_cache,
47 int regnum)
48 {
49 struct frame_unwind_cache *cache
50 = (struct frame_unwind_cache *) *this_prologue_cache;
51 struct value *value;
52
53 value = regcache_cooked_read_value (cache->regcache, regnum);
54 VALUE_NEXT_FRAME_ID (value) = sentinel_frame_id;
55
56 return value;
57 }
58
59 static void
60 sentinel_frame_this_id (struct frame_info *this_frame,
61 void **this_prologue_cache,
62 struct frame_id *this_id)
63 {
64 /* The sentinel frame is used as a starting point for creating the
65 previous (inner most) frame. That frame's THIS_ID method will be
66 called to determine the inner most frame's ID. Not this one. */
67 internal_error (__FILE__, __LINE__, _("sentinel_frame_this_id called"));
68 }
69
70 static struct gdbarch *
71 sentinel_frame_prev_arch (struct frame_info *this_frame,
72 void **this_prologue_cache)
73 {
74 struct frame_unwind_cache *cache
75 = (struct frame_unwind_cache *) *this_prologue_cache;
76
77 return cache->regcache->arch ();
78 }
79
80 const struct frame_unwind sentinel_frame_unwind =
81 {
82 SENTINEL_FRAME,
83 default_frame_unwind_stop_reason,
84 sentinel_frame_this_id,
85 sentinel_frame_prev_register,
86 NULL,
87 NULL,
88 NULL,
89 sentinel_frame_prev_arch,
90 };
gdbarch
Definition: gdbarch.c:127
SENTINEL_FRAME
Definition: frame.h:260
sentinel_frame_prev_arch
static struct gdbarch * sentinel_frame_prev_arch(struct frame_info *this_frame, void **this_prologue_cache)
Definition: sentinel-frame.c:71
sentinel_frame_id
const struct frame_id sentinel_frame_id
Definition: frame.c:576
VALUE_NEXT_FRAME_ID
#define VALUE_NEXT_FRAME_ID(val)
Definition: value.h:441
sentinel_frame_cache
void * sentinel_frame_cache(struct regcache *regcache)
Definition: sentinel-frame.c:33
internal_error
void internal_error(const char *file, int line, const char *fmt,...)
Definition: errors.c:50
sentinel_frame_unwind
const struct frame_unwind sentinel_frame_unwind
Definition: sentinel-frame.c:80
frame_info
Definition: frame.c:85
_
#define _(String)
Definition: gdb_locale.h:35
defs.h
FRAME_OBSTACK_ZALLOC
#define FRAME_OBSTACK_ZALLOC(TYPE)
Definition: frame.h:678
regcache.h
inferior.h
sentinel_frame_prev_register
static struct value * sentinel_frame_prev_register(struct frame_info *this_frame, void **this_prologue_cache, int regnum)
Definition: sentinel-frame.c:45
frame-unwind.h
frame_unwind_cache
Definition: sentinel-frame.c:27
regnum
int regnum
Definition: aarch64-tdep.c:77
value
Definition: value.c:169
regcache_cooked_read_value
struct value * regcache_cooked_read_value(struct regcache *regcache, int regnum)
Definition: regcache.c:714
regcache::arch
gdbarch * arch() const
Definition: regcache.c:221
frame_unwind
Definition: frame-unwind.h:144
default_frame_unwind_stop_reason
enum unwind_stop_reason default_frame_unwind_stop_reason(struct frame_info *this_frame, void **this_cache)
Definition: frame-unwind.c:184
regcache
Definition: regcache.h:232
sentinel-frame.h
frame_unwind_cache::regcache
struct regcache * regcache
Definition: sentinel-frame.c:29
frame_id
Definition: frame.h:111
sentinel_frame_this_id
static void sentinel_frame_this_id(struct frame_info *this_frame, void **this_prologue_cache, struct frame_id *this_id)
Definition: sentinel-frame.c:60