1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
|
/* This testcase is part of GDB, the GNU debugger.
Copyright 2024 Free Software Foundation, Inc.
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/>. */
/* Used to insert labels within function foo. */
#define LABEL(N) asm ("foo_label_" #N ": .globl foo_label_" #N)
volatile int global_var = 0;
/* The contents of this '#if 0' block exist so the generated debug can
point to these as the source lines. */
#if 0
void
bar (void) /* bar decl line */
{
/* bar line 1 */
/* bar line 2 */
}
void
baz (void) /* baz decl line */
{
/* baz line 1 */
/* baz line 2 */
}
void
foo (void) /* foo decl line */
{
/* foo line 1 */
/* foo line 2 */
/* foo line 3 */
/* foo line 4 */
}
#endif
extern void *foo_label_6 (void);
void
foo (void)
{
/* This label is used to find the start of 'foo' when generating the
debug information. */
asm ("foo_label: .globl foo_label");
++global_var;
LABEL (1);
++global_var;
LABEL (2);
++global_var;
LABEL (3);
++global_var;
/* This goto will always trigger, but we make it conditional so that the
compiler doesn't optimise out the code between the goto and the
destination.
Also 'goto *ADDR' is a GCC extension, but it is critical that the
destination address be a global label so that we can generate DWARF
that has ranges that start exactly at the destination address. */
if (global_var > 0)
goto *(&foo_label_6);
LABEL (4);
++global_var;
LABEL (5);
++global_var;
LABEL (6);
++global_var;
LABEL (7);
++global_var;
LABEL (8);
++global_var;
LABEL (9);
++global_var;
}
int
main (void)
{
asm ("main_label: .globl main_label");
foo ();
}
|
