Hi, all
We post this message for someone who might be put in a great
quandary like us.
Please look at the sample codes:
============================================================
#define NR_TEST_FUNCS 2
typedef code struct test_funcs {
void (*non)(void);
} test_funcs_c;
test_funcs_c * data test_funcs[NR_TEST_FUNCS];
uint8_t nr_test_funcs = 0;
void register_test_func(test_funcs_c *funcs)
{
if (nr_test_funcs < NR_TEST_FUNCS-1) {
test_funcs[nr_test_funcs] = funcs;
nr_test_funcs++;
}
}
void test_non(void)
{
dbg_dump(1);
}
test_funcs_c funcs1 = {
test_non,
};
test_funcs_c funcs2 = {
test_non,
};
static void test_funcs_ptr(void)
{
uint8_t i;
test_funcs_c *p;
register_test_func(&funcs1);
register_test_func(&funcs2);
for (i = 0; i < nr_test_funcs; i++) {
/* the way can work */
p = test_funcs[i];
(p->non)();
#if 0
/* the way cannot work */
(test_funcs[i]->non)();
#endif
}
}
============================================================
It seems a compiler bug, compiler cannot generate correct
codes for structure member location in the latter one.
Please look at the generated codes for the differences:
============================================================
; p = test_funcs[i];
mov a,r2
add a,r2
add a,#_test_funcs
mov r0,a
mov ar3,@r0
inc r0
mov ar4,@r0
dec r0
mov dpl,r3
mov dph,r4
; (p->non)();
clr a
movc a,@a+dptr
mov r3,a
inc dptr
clr a
movc a,@a+dptr
mov r4,a
push ar2
push ar3
push ar4
mov dpl,r3
mov dph,r4
lcall __sdcc_call_dptr
pop ar4
pop ar3
pop ar2
============================================================
; (test_funcs[i]->non)();
mov a,r2
add a,r2
add a,#_test_funcs
mov r0,a
mov ar0,@r0
mov ar3,@r0
inc r0
mov ar4,@r0
dec r0
push ar2
push ar3
push ar4
mov dpl,r3
mov dph,r4
lcall __sdcc_call_dptr
pop ar4
pop ar3
pop ar2
============================================================
Best regards/Lv Zheng
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