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/* -----------------------------------------------------------------------------
*
* (c) The GHC Team, 1998-2004
*
* Performing updates.
*
* ---------------------------------------------------------------------------*/
#ifndef UPDATES_H
#define UPDATES_H
#ifndef CMINUSMINUS
#include "BeginPrivate.h"
#endif
/* -----------------------------------------------------------------------------
Updates
-------------------------------------------------------------------------- */
/* LDV profiling:
* After all, we do *NOT* need to call LDV_RECORD_CREATE() for IND
* closures because they are inherently used. But, it corrupts
* the invariants that every closure keeps its creation time in the profiling
* field. So, we call LDV_RECORD_CREATE().
*/
/* We have two versions of this macro (sadly), one for use in C-- code,
* and the other for C.
*
* The and_then argument is a performance hack so that we can paste in
* the continuation code directly. It helps shave a couple of
* instructions off the common case in the update code, which is
* worthwhile (the update code is often part of the inner loop).
* (except that gcc now appears to common up this code again and
* invert the optimisation. Grrrr --SDM).
*/
#ifdef CMINUSMINUS
#define updateWithIndirection(p1, p2, and_then) \
W_ bd; \
\
OVERWRITING_CLOSURE(p1); \
StgInd_indirectee(p1) = p2; \
prim %write_barrier() []; \
SET_INFO(p1, stg_BLACKHOLE_info); \
LDV_RECORD_CREATE(p1); \
bd = Bdescr(p1); \
if (bdescr_gen_no(bd) != 0 :: bits16) { \
recordMutableCap(p1, TO_W_(bdescr_gen_no(bd)), R1); \
TICK_UPD_OLD_IND(); \
and_then; \
} else { \
TICK_UPD_NEW_IND(); \
and_then; \
}
#else /* !CMINUSMINUS */
INLINE_HEADER void updateWithIndirection (Capability *cap,
StgClosure *p1,
StgClosure *p2)
{
bdescr *bd;
ASSERT( (P_)p1 != (P_)p2 );
/* not necessarily true: ASSERT( !closure_IND(p1) ); */
/* occurs in RaiseAsync.c:raiseAsync() */
OVERWRITING_CLOSURE(p1);
((StgInd *)p1)->indirectee = p2;
write_barrier();
SET_INFO(p1, &stg_BLACKHOLE_info);
LDV_RECORD_CREATE(p1);
bd = Bdescr((StgPtr)p1);
if (bd->gen_no != 0) {
recordMutableCap(p1, cap, bd->gen_no);
TICK_UPD_OLD_IND();
} else {
TICK_UPD_NEW_IND();
}
}
#endif /* CMINUSMINUS */
#ifndef CMINUSMINUS
#include "EndPrivate.h"
#endif
#endif /* UPDATES_H */
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