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
|
static inline int
m(char *name, int i, long j)
{
// Random syntactical block to be inlined.
// Mimics what STAP_PROBE macro does a bit.
do {
// Dummy (volatile) counter to trick gcc into thinking we are actually
// using the label. If not it will partially optimize the label away,
// but still emits a somewhat bogus DW_AT_low_pc for it...
volatile int c = 0;
volatile __typeof__(name) p_name = name;
volatile __typeof__(i) p_i = i;
volatile __typeof__(j) p_j = j;
// empty asm to force locals into regs.
inlined_label: asm volatile ("" : "=g"(c) : "g"(p_name), "g"(p_i), "g"(p_j));
if (c != 0) goto inlined_label;
} while (0);
return i + 32;
}
static inline int
call(int pi, long pj)
{
volatile ic = pi - 42;
volatile jc = pj + 42;
return m("call", ic, jc);
}
static inline int
call2(int pi2, long pj2)
{
volatile ic2 = pi2 + 64;
volatile jc2 = pj2 - 64;
return m("call2", ic2, jc2);
}
int
main (int argc, char **argv)
{
volatile int i = 64;
volatile long j = 42;
call(i, j);
call2(i, j);
m("main", i, j);
return 0;
}
|
