diff options
Diffstat (limited to 'gc/obj_map.c')
| -rw-r--r-- | gc/obj_map.c | 147 |
1 files changed, 0 insertions, 147 deletions
diff --git a/gc/obj_map.c b/gc/obj_map.c deleted file mode 100644 index d002d65..0000000 --- a/gc/obj_map.c +++ /dev/null @@ -1,147 +0,0 @@ -/* - * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers - * Copyright (c) 1991, 1992 by Xerox Corporation. All rights reserved. - * Copyright (c) 1999-2001 by Hewlett-Packard Company. 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. - */ - -/* Routines for maintaining maps describing heap block - * layouts for various object sizes. Allows fast pointer validity checks - * and fast location of object start locations on machines (such as SPARC) - * with slow division. - */ - -# include "private/gc_priv.h" - -map_entry_type * GC_invalid_map = 0; - -/* Invalidate the object map associated with a block. Free blocks */ -/* are identified by invalid maps. */ -void GC_invalidate_map(hhdr) -hdr *hhdr; -{ - register int displ; - - if (GC_invalid_map == 0) { - GC_invalid_map = (map_entry_type *)GC_scratch_alloc(MAP_SIZE); - if (GC_invalid_map == 0) { - GC_err_printf0( - "Cant initialize GC_invalid_map: insufficient memory\n"); - EXIT(); - } - for (displ = 0; displ < HBLKSIZE; displ++) { - MAP_ENTRY(GC_invalid_map, displ) = OBJ_INVALID; - } - } - hhdr -> hb_map = GC_invalid_map; -} - -/* Consider pointers that are offset bytes displaced from the beginning */ -/* of an object to be valid. */ - -# if defined(__STDC__) || defined(__cplusplus) - void GC_register_displacement(GC_word offset) -# else - void GC_register_displacement(offset) - GC_word offset; -# endif -{ - DCL_LOCK_STATE; - - DISABLE_SIGNALS(); - LOCK(); - GC_register_displacement_inner(offset); - UNLOCK(); - ENABLE_SIGNALS(); -} - -void GC_register_displacement_inner(offset) -word offset; -{ - register unsigned i; - word map_entry = BYTES_TO_WORDS(offset); - - if (offset >= VALID_OFFSET_SZ) { - ABORT("Bad argument to GC_register_displacement"); - } - if (map_entry > MAX_OFFSET) map_entry = OFFSET_TOO_BIG; - if (!GC_valid_offsets[offset]) { - GC_valid_offsets[offset] = TRUE; - GC_modws_valid_offsets[offset % sizeof(word)] = TRUE; - if (!GC_all_interior_pointers) { - for (i = 0; i <= MAXOBJSZ; i++) { - if (GC_obj_map[i] != 0) { - if (i == 0) { - GC_obj_map[i][offset] = (map_entry_type)map_entry; - } else { - register unsigned j; - register unsigned lb = WORDS_TO_BYTES(i); - - if (offset < lb) { - for (j = offset; j < HBLKSIZE; j += lb) { - GC_obj_map[i][j] = (map_entry_type)map_entry; - } - } - } - } - } - } - } -} - - -/* Add a heap block map for objects of size sz to obj_map. */ -/* Return FALSE on failure. */ -GC_bool GC_add_map_entry(sz) -word sz; -{ - register unsigned obj_start; - register unsigned displ; - register map_entry_type * new_map; - word map_entry; - - if (sz > MAXOBJSZ) sz = 0; - if (GC_obj_map[sz] != 0) { - return(TRUE); - } - new_map = (map_entry_type *)GC_scratch_alloc(MAP_SIZE); - if (new_map == 0) return(FALSE); -# ifdef PRINTSTATS - GC_printf1("Adding block map for size %lu\n", (unsigned long)sz); -# endif - for (displ = 0; displ < HBLKSIZE; displ++) { - MAP_ENTRY(new_map,displ) = OBJ_INVALID; - } - if (sz == 0) { - for(displ = 0; displ <= HBLKSIZE; displ++) { - if (OFFSET_VALID(displ)) { - map_entry = BYTES_TO_WORDS(displ); - if (map_entry > MAX_OFFSET) map_entry = OFFSET_TOO_BIG; - MAP_ENTRY(new_map,displ) = (map_entry_type)map_entry; - } - } - } else { - for (obj_start = 0; - obj_start + WORDS_TO_BYTES(sz) <= HBLKSIZE; - obj_start += WORDS_TO_BYTES(sz)) { - for (displ = 0; displ < WORDS_TO_BYTES(sz); displ++) { - if (OFFSET_VALID(displ)) { - map_entry = BYTES_TO_WORDS(displ); - if (map_entry > MAX_OFFSET) map_entry = OFFSET_TOO_BIG; - MAP_ENTRY(new_map, obj_start + displ) = - (map_entry_type)map_entry; - } - } - } - } - GC_obj_map[sz] = new_map; - return(TRUE); -} |