So this silly test case now works:
//------------------------------------------------------------------
// silly test of computed goto
proc fred () {
println$ "Hello";
var x = 10;
lab1:>
println$ "Next";
--x;
var labvar = (label_address lab1);
if x > 0 do
goto-indirect labvar;
done
}
fred;
//--------------------------------------------------------------
The syntax "label_address lab1" is a temporary hack.
I'm using "goto-indirect expr" for the computed goto.
Tested only with GCC (assembler labels).
This test relies on a number of things which are satisfied only by luck.
The generated C++ looks like this:
//PROCEDURE <36838:> _init_: Resume method
::flx::rtl::con_t *_init_::resume(){
FLX_START_SWITCH(_init_)
_i38392_v38392_x = ::std::string("Hello"); //init
_i38393_v38393_s = stdout; //init
_i38394_v38394_x = _i38392_v38392_x; //init
{
_a10927t_44980 _tmp44994 = _i38394_v38394_x + ::std::string("\n") ;
::flx::rtl::ioutil::write(_i38393_v38393_s,_tmp44994);
}
_i38390_v38390_x = 10; //assign simple
FLX_LABEL(44992,36838,_38388)
_i38395_v38395_x = ::std::string("Next"); //init
s = stdout; //init
x = _i38395_v38395_x; //init
{
_a10927t_44980 _tmp44995 = x + ::std::string("\n") ;
::flx::rtl::ioutil::write(s,_tmp44995);
}
{
int* _tmp44996 = (int*)&_i38390_v38390_x;
--*_tmp44996;
}
labvar =
::flx::rtl::jump_address_t(this,FLX_FARTARGET(44992,36838,_38388)); //assign
simple
if(!((0 < _i38390_v38390_x))) goto _38389;
FLX_DIRECT_LONG_JUMP(_init_, labvar)
_38389:;
FLX_RETURN
FLX_END_SWITCH
}
One piece of luck: the argument #2 to the LONG_JUMP macro doesn't
contain any commas (macros can't handle that). I'll have to assign the
expression
to a simple variable and use that instead.
--
john skaller
[email protected]
http://felix-lang.org
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