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/* -----------------------------------------------------------------------------
*
* (c) The GHC Team, 1998-2009
*
* Stable Pointers
*
* Do not #include this file directly: #include "Rts.h" instead.
*
* To understand the structure of the RTS headers, see the wiki:
* https://gitlab.haskell.org/ghc/ghc/wikis/commentary/source-tree/includes
*
* ---------------------------------------------------------------------------*/
#pragma once
ATTR_ALWAYS_INLINE EXTERN_INLINE StgPtr deRefStablePtr (StgStablePtr stable_ptr);
StgStablePtr getStablePtr (StgPtr p);
/* -----------------------------------------------------------------------------
PRIVATE from here.
-------------------------------------------------------------------------- */
typedef struct {
StgPtr addr; // Haskell object when entry is in use, next free
// entry (NULL when this is the last free entry)
// otherwise.
} spEntry;
extern DLL_IMPORT_RTS spEntry *stable_ptr_table;
ATTR_ALWAYS_INLINE EXTERN_INLINE
StgPtr deRefStablePtr(StgStablePtr sp)
{
// acquire load to ensure that we see the new SPT if it has been recently
// enlarged.
const spEntry *spt = ACQUIRE_LOAD(&stable_ptr_table);
// acquire load to ensure that the referenced object is visible.
return ACQUIRE_LOAD(&spt[(StgWord)sp].addr);
}
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