[aspectc-user] keyword volatile and bid structures

[Olaf Spinczyk]

Hello Jörg,

this problem is related to the new (and still experimental) static type
introspection mechanism of AspectC++. I will look into that problem today.

- Olaf

J. Liebig schrieb:
> Hi everyone,
>
> I'm using AspectC++ for static introductions (via slice classes)
> to existing structures, that contain bitstructures. The weaving
> works fine, but when I try to compile, it fails with:
>
> avr-gcc -o main -mmcu=at90can128 -O2 main.cc     
> Led.ah: In member function 'const void* LED0::__attr(unsigned int) const':
> Led.ah:26: error: invalid conversion from 'const volatile void*' to
> 'const void*'
> Led.ah:26: error: attempt to take address of bit-field structure member
> 'LED0::LEDPIN'
> Led.ah:26: error: attempt to take address of bit-field structure member
> 'LED0::LEDDDR'
> Led.ah:26: error: attempt to take address of bit-field structure member
> 'LED0::LEDPORT'
>
> I'm using:
> ac++ 1.0pre4 svn (Jul  9 2008) and
> gcc version 4.0.2
>
>
>
> The examle is as follows:
> // Led.h
> #include <inttypes.h>
>
> class LED0 {
> public:
>         volatile uint8_t _pad[0x20];
>
>         // PINA
>         volatile uint8_t
>                 LEDPIN  : 1,
>                                 : 7;
>
>         // DDRA
>         volatile uint8_t
>                 LEDDDR  : 1,
>                                 : 7;
>
>         // PORTA
>         volatile uint8_t
>                 LEDPORT : 1,
>                                 : 7;
> };
>
>
> // Led.ah
> #ifndef __LED_AH__
> #define __LED_AH__
>
> aspect Led {
>         pointcut ledfunc() = "LED%";
>
>         advice ledfunc() : slice class S {
>         public:
>                 S() {
>                         LEDPORT = 0;
>                         LEDDDR  = 1;
>                 }
>
>                 void on() {
>                         LEDPORT = 1;
>                 }
>
>                 void off() {
>                         LEDPORT = 0;
>                 }
>         };
> };
>
> #endif // __LED_AH__
>
>
>
> // main.cc
> #include "Led.h"
>
> int main(int argc, char** argv) {
>         LED0& l0 = *((LED0*) 0x00);
>         l0.on();
>
>         while(1)
>                 ;
> }
>
>
> kind regards
> Joerg Liebig
>
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