[sdcc-devel] [ sdcc-Support Requests-2994916 ] problem in static structure intialization

[SourceForge.net <no...@so...>]

Support Requests item #2994916, was opened at 2010-04-30 11:55
Message generated for change (Comment added) made by maartenbrock
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=200599&aid=2994916&group_id=599

Please note that this message will contain a full copy of the comment thread,
including the initial issue submission, for this request,
not just the latest update.
Category: None
Group: None
>Status: Pending
Priority: 5
Private: No
Submitted By: Robert Ramey (ramey)
Assigned to: Nobody/Anonymous (nobody)
Summary: problem in static  structure intialization

Initial Comment:
problem initializing structures.

When I have code like

static struct s = {
const void (*fpr)();
...
...
} = {
...

I notice when tracing through with the debugger that the target of fptr is the ADDRESS of the function rather than the variable "fptr"

See attached code and asm list



----------------------------------------------------------------------

>Comment By: Maarten Brock (maartenbrock)
Date: 2011-11-05 01:51

Message:
Since there were no updates in 1.5 year and I still don't get what the
question is, I set this item pending.

----------------------------------------------------------------------

Comment By: Maarten Brock (maartenbrock)
Date: 2010-05-01 01:45

Message:
I fail to see the relationship between your two posts.

Function pointers are difficult because according to spec you can
dereference them both with and without the dereference operator esp. when
calling them.

And is fpr a typing error of fptr?

----------------------------------------------------------------------

Comment By: Robert Ramey (ramey)
Date: 2010-04-30 22:41

Message:
I tried to reproduce this in a small example but was unsuccessful.  In my
real application I made this go away by moving a const static array of
structures from a local function context to file context.

Robert Ramey


void
gps_simulate_proxy(){
const static struct {
    INT16 gps_velocity;    /* knots * 10 */
    angle_gps gps_course;  /* degrees * 10 */
    INT16 airspeed;         /* m/s * 8 */
} test_data [] = {
    {97,1800,105},
    {97,-1722,105},
    {97,-1644,105},
    {97,-1567,105},
    {98,-1489,105},
....
    static UINT8 i = 0;
    last.as_8 = test_data[i].gps_course;
    gbvario_gps_velocity_task(test_data[i].gps_velocity);
    gbvario_gps_heading_task(test_data[i].gps_course);
    if(++i > sizeof(test_data) / sizeof(test_data[0]))
        i = 0;
}

to 

const static struct {
    INT16 gps_velocity;    /* knots * 10 */
    angle_gps gps_course;  /* degrees * 10 */
    INT16 airspeed;         /* m/s * 8 */
} test_data [] = {
    {97,1800,105},
    {97,-1722,105},
    {97,-1644,105},
    {97,-1567,105},
    {98,-1489,105},
    ...
void
gps_simulate_proxy(){
    static UINT8 i = 0;
    last.as_8 = test_data[i].gps_course;
    gbvario_gps_velocity_task(test_data[i].gps_velocity);
    gbvario_gps_heading_task(test_data[i].gps_course);
    if(++i > sizeof(test_data) / sizeof(test_data[0]))
        i = 0;
}



----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=200599&aid=2994916&group_id=599