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/* -----------------------------------------------------------------------------
*
* (c) The GHC Team 1998-2008
*
* Compacting garbage collector
*
* Documentation on the architecture of the Garbage Collector can be
* found in the online commentary:
*
* http://hackage.haskell.org/trac/ghc/wiki/Commentary/Rts/Storage/GC
*
* ---------------------------------------------------------------------------*/
#ifndef SM_COMPACT_H
#define SM_COMPACT_H
INLINE_HEADER rtsBool
mark_stack_empty(void)
{
return mark_sp == mark_stack;
}
INLINE_HEADER rtsBool
mark_stack_full(void)
{
return mark_sp >= mark_splim;
}
INLINE_HEADER void
reset_mark_stack(void)
{
mark_sp = mark_stack;
}
INLINE_HEADER void
push_mark_stack(StgPtr p)
{
*mark_sp++ = p;
}
INLINE_HEADER StgPtr
pop_mark_stack(void)
{
return *--mark_sp;
}
INLINE_HEADER void
mark(StgPtr p, bdescr *bd)
{
nat offset_within_block = p - bd->start; // in words
StgPtr bitmap_word = (StgPtr)bd->u.bitmap +
(offset_within_block / (sizeof(W_)*BITS_PER_BYTE));
StgWord bit_mask = (StgWord)1 << (offset_within_block & (sizeof(W_)*BITS_PER_BYTE - 1));
*bitmap_word |= bit_mask;
}
INLINE_HEADER void
unmark(StgPtr p, bdescr *bd)
{
nat offset_within_block = p - bd->start; // in words
StgPtr bitmap_word = (StgPtr)bd->u.bitmap +
(offset_within_block / (sizeof(W_)*BITS_PER_BYTE));
StgWord bit_mask = (StgWord)1 << (offset_within_block & (sizeof(W_)*BITS_PER_BYTE - 1));
*bitmap_word &= ~bit_mask;
}
INLINE_HEADER StgWord
is_marked(StgPtr p, bdescr *bd)
{
nat offset_within_block = p - bd->start; // in words
StgPtr bitmap_word = (StgPtr)bd->u.bitmap +
(offset_within_block / (sizeof(W_)*BITS_PER_BYTE));
StgWord bit_mask = (StgWord)1 << (offset_within_block & (sizeof(W_)*BITS_PER_BYTE - 1));
return (*bitmap_word & bit_mask);
}
extern void compact (StgClosure *static_objects);
#endif /* SM_COMPACT_H */
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