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/* -----------------------------------------------------------------------------
*
* (c) The GHC Team 1998-2009
*
* Operations on the mark stack
*
* Documentation on the architecture of the Garbage Collector can be
* found in the online commentary:
*
* http://ghc.haskell.org/trac/ghc/wiki/Commentary/Rts/Storage/GC
*
* ---------------------------------------------------------------------------*/
#ifndef SM_MARKSTACK_H
#define SM_MARKSTACK_H
#include "BeginPrivate.h"
INLINE_HEADER void
push_mark_stack(StgPtr p)
{
bdescr *bd;
*mark_sp++ = (StgWord)p;
if (((W_)mark_sp & BLOCK_MASK) == 0)
{
if (mark_stack_bd->u.back != NULL)
{
mark_stack_bd = mark_stack_bd->u.back;
}
else
{
bd = allocBlock_sync();
bd->link = mark_stack_bd;
bd->u.back = NULL;
mark_stack_bd->u.back = bd; // double-link the new block on
mark_stack_top_bd = bd;
mark_stack_bd = bd;
}
mark_sp = mark_stack_bd->start;
}
}
INLINE_HEADER StgPtr
pop_mark_stack(void)
{
if (((W_)mark_sp & BLOCK_MASK) == 0)
{
if (mark_stack_bd->link == NULL)
{
return NULL;
}
else
{
mark_stack_bd = mark_stack_bd->link;
mark_sp = mark_stack_bd->start + BLOCK_SIZE_W;
}
}
return (StgPtr)*--mark_sp;
}
INLINE_HEADER rtsBool
mark_stack_empty(void)
{
return (((W_)mark_sp & BLOCK_MASK) == 0 && mark_stack_bd->link == NULL);
}
#include "EndPrivate.h"
#endif /* SM_MARKSTACK_H */
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