/*
 * The following small c++ program has been translated to c using
 * one Cfront 2.0 port. If you look at generated c code, you will
 *  see that the code generated for inlines member functions is different
 * for local variables and global variables (it is also true for global
 * pointer)
 *
 * Could someone explain me why ?
 *
 * PS: I think that the code is ineffective. Tell me if I am wrong.
 *
 */

/*
 *
 * Sorry to post it in these news group, I have already post it in
 * comp.lang.c++ and got no answer.
 */


/* Small C++ program
 * --------------------------------------------------------------------------
 *
 */

class example {
private :
 int a;
public :
 int getVal() {return a;}
 void setVal(int val) {a = val;}
};

example glob;

void f()
{
 example loc;
 int a = 1;
 int b = 2;
 int resu;

 loc.setVal(1);
 resu = loc.getVal();

 glob.setVal(1);

 resu = glob.getVal();
}

/*
 * Generated C code
 * -------------------------------------------------------------------------
 *
 */

/* <<AT&T C++ Translator 2.00.02 08/25/89>> */
/* < kt34.cxx > */

char *__vec_new ();

char __vec_delete ();
typedef int (*__vptp)();
struct __mptr {
 short d;
 short i;
 __vptp f;
};

struct example { /* sizeof example == 4 */

 int a__7example ;
};

struct example glob = {
 0 };

char f__Fv ()
{
 struct example __1loc ;
 int __1a ;
 int __1b ;
 int __1resu ;

 struct example *__0__Xthis00a3jpkk ;

 struct example *__0__Xthis0020bpkk ;

 __1a = 1 ;
 __1b = 2 ;

 ( ((&__1loc )->a__7example = 1 ), (((char )0 ))) ;
 __1resu = ( (&__1loc )->a__7example ) ;

/*
 * for local variables the c code is what I expected.
 */


 ( (__0__Xthis00a3jpkk = (&glob )), ( (__0__Xthis00a3jpkk ->a__7example = 1 ), (((char )0 ))) ) ;
 __1resu = ( (__0__Xthis0020bpkk = (&glob )), ( __0__Xthis0020bpkk ->a__7example ) ) ;
/*
 * Why two copies? Why into two differents local variables?
 */
}







--
   __
  /  `                    Eric Valette
 /--   __  o _.           Chorus Systemes
(___, / (_(_(__          6 avenue Gustave Eiffel
    F-78182, St-Quentin-en-Yvelines-Cedex

Tel: +33 (1) 30 64 82 00 Fax: +33 (1) 30 57 00 66
E-mail: ev@chorus.fr  or ev%chorus.fr@mcsun.EU.net