static THROW_RO *throwRoGet( // GET THROW R/O BLOCK
TYPE type ) // - type being thrown
{
THROW_RO *srch; // - search R/O block for symbol
THROW_RO *ro; // - R/O block for symbol
SYMBOL sym; // - symbol for throw object
THROW_CNV_CTL ctl; // - control area
target_offset_t offset; // - offset ( not used )
type = TypeCanonicalThr( type );
ro = NULL;
RingIterBeg( ring_throw_ro, srch ) {
if( TypesIdentical( srch->sig->type, type ) ) {
ro = srch;
break;
}
} RingIterEnd( srch );
if( ro == NULL ) {
ro = RingCarveAlloc( carveTHROW_RO, &ring_throw_ro );
ro->sig = BeTypeSignature( type );
ro->emitted = false;
sym = CgVarRo( CgbkInfo.size_offset + sizeOfThrowCnv() * ThrowCnvInit( &ctl, type ),
SC_PUBLIC, CppNameThrowRo( type ) );
ro->sym = sym;
for( ; ; ) {
type = ThrowCnvType( &ctl, &offset );
if( type == NULL )
break;
BeTypeSignature( type );
}
ThrowCnvFini( &ctl );
}
return( ro );
}
static bool throwCnvFront( // GET FRONT-END INFO. FOR THROW TYPE
TYPE type, // - type to be thrown
PTREE expr ) // - expression for errors
{
bool ret; // - return value
THROW_CNV_CTL ctl; // - control information
PTreeExtractLocn( expr, &ctl.err_locn );
ThrowCnvInit( &ctl, type );
ret = ! ctl.error_occurred;
ThrowCnvFini( &ctl );
return ret;
}
void ThrowRoGen( // GENERATE A THROW R/O BLOCK
void )
{
THROW_RO *ro; // - R/O block for symbol
segment_id old_seg; // - old segment
TYPE type; // - type being converted
THROW_CNV_CTL ctl; // - control for conversions
target_offset_t offset; // - offset within class
RingIterBeg( ring_throw_ro, ro ) {
if( ! ro->emitted ) {
ro->emitted = true;
old_seg = DgSetSegSym( ro->sym );
CgBackGenLabelInternal( ro->sym );
offset = ThrowCnvInit( &ctl, ro->sig->type );
DbgVerify( ! ctl.error_occurred
, "cgGenThrowRo -- failure in ThrowCnvInit" );
#ifndef NDEBUG
if( PragDbgToggle.dump_stab ) {
printf( "ThrowRo[%p] offset=%p sig=%x\n"
, ro
, ro->sig
, offset );
}
#endif
DgOffset( offset );
for( ; ; ) {
type = ThrowCnvType( &ctl, &offset );
if( type == NULL )
break;
cgGenThrowCnv( type, offset );
}
ThrowCnvFini( &ctl );
BESetSeg( old_seg );
}
} RingIterEnd( ro );
}