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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [boehm-gc/] [obj_map.c] - Rev 735
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/* * 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); }
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