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Diffstat (limited to 'gc/gc_hdrs.h')
| -rw-r--r-- | gc/gc_hdrs.h | 135 |
1 files changed, 0 insertions, 135 deletions
diff --git a/gc/gc_hdrs.h b/gc/gc_hdrs.h deleted file mode 100644 index 60dc2ad..0000000 --- a/gc/gc_hdrs.h +++ /dev/null @@ -1,135 +0,0 @@ -/* - * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers - * Copyright (c) 1991-1994 by Xerox Corporation. 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. - */ -/* Boehm, July 11, 1995 11:54 am PDT */ -# ifndef GC_HEADERS_H -# define GC_HEADERS_H -typedef struct hblkhdr hdr; - -# if CPP_WORDSZ != 32 && CPP_WORDSZ < 36 - --> Get a real machine. -# endif - -/* - * The 2 level tree data structure that is used to find block headers. - * If there are more than 32 bits in a pointer, the top level is a hash - * table. - */ - -# if CPP_WORDSZ > 32 -# define HASH_TL -# endif - -/* Define appropriate out-degrees for each of the two tree levels */ -# ifdef SMALL_CONFIG -# define LOG_BOTTOM_SZ 11 - /* Keep top index size reasonable with smaller blocks. */ -# else -# define LOG_BOTTOM_SZ 10 -# endif -# ifndef HASH_TL -# define LOG_TOP_SZ (WORDSZ - LOG_BOTTOM_SZ - LOG_HBLKSIZE) -# else -# define LOG_TOP_SZ 11 -# endif -# define TOP_SZ (1 << LOG_TOP_SZ) -# define BOTTOM_SZ (1 << LOG_BOTTOM_SZ) - -typedef struct bi { - hdr * index[BOTTOM_SZ]; - /* - * The bottom level index contains one of three kinds of values: - * 0 means we're not responsible for this block, - * or this is a block other than the first one in a free block. - * 1 < (long)X <= MAX_JUMP means the block starts at least - * X * HBLKSIZE bytes before the current address. - * A valid pointer points to a hdr structure. (The above can't be - * valid pointers due to the GET_MEM return convention.) - */ - struct bi * asc_link; /* All indices are linked in */ - /* ascending order... */ - struct bi * desc_link; /* ... and in descending order. */ - word key; /* high order address bits. */ -# ifdef HASH_TL - struct bi * hash_link; /* Hash chain link. */ -# endif -} bottom_index; - -/* extern bottom_index GC_all_nils; - really part of GC_arrays */ - -/* extern bottom_index * GC_top_index []; - really part of GC_arrays */ - /* Each entry points to a bottom_index. */ - /* On a 32 bit machine, it points to */ - /* the index for a set of high order */ - /* bits equal to the index. For longer */ - /* addresses, we hash the high order */ - /* bits to compute the index in */ - /* GC_top_index, and each entry points */ - /* to a hash chain. */ - /* The last entry in each chain is */ - /* GC_all_nils. */ - - -# define MAX_JUMP (HBLKSIZE - 1) - -# define HDR_FROM_BI(bi, p) \ - ((bi)->index[((word)(p) >> LOG_HBLKSIZE) & (BOTTOM_SZ - 1)]) -# ifndef HASH_TL -# define BI(p) (GC_top_index \ - [(word)(p) >> (LOG_BOTTOM_SZ + LOG_HBLKSIZE)]) -# define HDR_INNER(p) HDR_FROM_BI(BI(p),p) -# ifdef SMALL_CONFIG -# define HDR(p) GC_find_header((ptr_t)(p)) -# else -# define HDR(p) HDR_INNER(p) -# endif -# define GET_BI(p, bottom_indx) (bottom_indx) = BI(p) -# define GET_HDR(p, hhdr) (hhdr) = HDR(p) -# define SET_HDR(p, hhdr) HDR_INNER(p) = (hhdr) -# define GET_HDR_ADDR(p, ha) (ha) = &(HDR_INNER(p)) -# else /* hash */ -/* Hash function for tree top level */ -# define TL_HASH(hi) ((hi) & (TOP_SZ - 1)) -/* Set bottom_indx to point to the bottom index for address p */ -# define GET_BI(p, bottom_indx) \ - { \ - register word hi = \ - (word)(p) >> (LOG_BOTTOM_SZ + LOG_HBLKSIZE); \ - register bottom_index * _bi = GC_top_index[TL_HASH(hi)]; \ - \ - while (_bi -> key != hi && _bi != GC_all_nils) \ - _bi = _bi -> hash_link; \ - (bottom_indx) = _bi; \ - } -# define GET_HDR_ADDR(p, ha) \ - { \ - register bottom_index * bi; \ - \ - GET_BI(p, bi); \ - (ha) = &(HDR_FROM_BI(bi, p)); \ - } -# define GET_HDR(p, hhdr) { register hdr ** _ha; GET_HDR_ADDR(p, _ha); \ - (hhdr) = *_ha; } -# define SET_HDR(p, hhdr) { register hdr ** _ha; GET_HDR_ADDR(p, _ha); \ - *_ha = (hhdr); } -# define HDR(p) GC_find_header((ptr_t)(p)) -# endif - -/* Is the result a forwarding address to someplace closer to the */ -/* beginning of the block or NIL? */ -# define IS_FORWARDING_ADDR_OR_NIL(hhdr) ((unsigned long) (hhdr) <= MAX_JUMP) - -/* Get an HBLKSIZE aligned address closer to the beginning of the block */ -/* h. Assumes hhdr == HDR(h) and IS_FORWARDING_ADDR(hhdr). */ -# define FORWARDED_ADDR(h, hhdr) ((struct hblk *)(h) - (unsigned long)(hhdr)) -# endif /* GC_HEADERS_H */ |