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/*
* Copyright (c) 1999 by Silicon Graphics. All rights reserved.
*
* THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
* OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
*
* Permission is hereby granted to use or copy this program
* for any purpose, provided the above notices are retained on all copies.
* Permission to modify the code and to distribute modified code is granted,
* provided the above notices are retained, and a notice that the code was
* modified is included with the above copyright notice.
*/
/* Descriptor for allocation request. May be redefined by client. */
typedef struct {
GC_word bitmap; /* Bitmap describing pointer locations. */
/* High order bit correspond to 0th */
/* word. 2 lsbs must be 0. */
size_t length; /* In bytes, must be multiple of word */
/* size. Must be >0, <= 512 */
} * GC_copy_descriptor;
/* The collector accesses descriptors only through these two macros. */
#define GC_SIZE_FROM_DESCRIPTOR(d) ((d) -> length)
#define GC_BIT_MAP_FROM_DESCRIPTOR(d) ((d) -> bitmap)
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