641 lines
18 KiB
C
641 lines
18 KiB
C
/*
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* Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
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* Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
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* Copyright (c) 1996 by Silicon Graphics. All rights reserved.
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* Copyright (c) 2000 by Hewlett-Packard Company. All rights reserved.
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*
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* THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
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* OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
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*
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* Permission is hereby granted to use or copy this program
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* for any purpose, provided the above notices are retained on all copies.
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* Permission to modify the code and to distribute modified code is granted,
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* provided the above notices are retained, and a notice that the code was
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* modified is included with the above copyright notice.
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*/
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/*
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* These are extra allocation routines which are likely to be less
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* frequently used than those in malloc.c. They are separate in the
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* hope that the .o file will be excluded from statically linked
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* executables. We should probably break this up further.
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*/
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#include <stdio.h>
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#include "private/gc_priv.h"
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extern ptr_t GC_clear_stack(); /* in misc.c, behaves like identity */
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void GC_extend_size_map(); /* in misc.c. */
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GC_bool GC_alloc_reclaim_list(); /* in malloc.c */
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/* Some externally visible but unadvertised variables to allow access to */
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/* free lists from inlined allocators without including gc_priv.h */
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/* or introducing dependencies on internal data structure layouts. */
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ptr_t * GC_CONST GC_objfreelist_ptr = GC_objfreelist;
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ptr_t * GC_CONST GC_aobjfreelist_ptr = GC_aobjfreelist;
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ptr_t * GC_CONST GC_uobjfreelist_ptr = GC_uobjfreelist;
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# ifdef ATOMIC_UNCOLLECTABLE
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ptr_t * GC_CONST GC_auobjfreelist_ptr = GC_auobjfreelist;
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# endif
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GC_PTR GC_generic_or_special_malloc(lb,knd)
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word lb;
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int knd;
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{
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switch(knd) {
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# ifdef STUBBORN_ALLOC
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case STUBBORN:
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return(GC_malloc_stubborn((size_t)lb));
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# endif
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case PTRFREE:
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return(GC_malloc_atomic((size_t)lb));
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case NORMAL:
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return(GC_malloc((size_t)lb));
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case UNCOLLECTABLE:
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return(GC_malloc_uncollectable((size_t)lb));
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# ifdef ATOMIC_UNCOLLECTABLE
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case AUNCOLLECTABLE:
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return(GC_malloc_atomic_uncollectable((size_t)lb));
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# endif /* ATOMIC_UNCOLLECTABLE */
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default:
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return(GC_generic_malloc(lb,knd));
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}
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}
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/* Change the size of the block pointed to by p to contain at least */
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/* lb bytes. The object may be (and quite likely will be) moved. */
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/* The kind (e.g. atomic) is the same as that of the old. */
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/* Shrinking of large blocks is not implemented well. */
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# ifdef __STDC__
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GC_PTR GC_realloc(GC_PTR p, size_t lb)
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# else
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GC_PTR GC_realloc(p,lb)
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GC_PTR p;
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size_t lb;
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# endif
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{
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register struct hblk * h;
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register hdr * hhdr;
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register word sz; /* Current size in bytes */
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register word orig_sz; /* Original sz in bytes */
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int obj_kind;
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if (p == 0) return(GC_malloc(lb)); /* Required by ANSI */
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h = HBLKPTR(p);
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hhdr = HDR(h);
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sz = hhdr -> hb_sz;
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obj_kind = hhdr -> hb_obj_kind;
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sz = WORDS_TO_BYTES(sz);
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orig_sz = sz;
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if (sz > MAXOBJBYTES) {
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/* Round it up to the next whole heap block */
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register word descr;
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sz = (sz+HBLKSIZE-1) & (~HBLKMASK);
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hhdr -> hb_sz = BYTES_TO_WORDS(sz);
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descr = GC_obj_kinds[obj_kind].ok_descriptor;
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if (GC_obj_kinds[obj_kind].ok_relocate_descr) descr += sz;
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hhdr -> hb_descr = descr;
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if (IS_UNCOLLECTABLE(obj_kind)) GC_non_gc_bytes += (sz - orig_sz);
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/* Extra area is already cleared by GC_alloc_large_and_clear. */
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}
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if (ADD_SLOP(lb) <= sz) {
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if (lb >= (sz >> 1)) {
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# ifdef STUBBORN_ALLOC
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if (obj_kind == STUBBORN) GC_change_stubborn(p);
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# endif
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if (orig_sz > lb) {
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/* Clear unneeded part of object to avoid bogus pointer */
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/* tracing. */
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/* Safe for stubborn objects. */
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BZERO(((ptr_t)p) + lb, orig_sz - lb);
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}
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return(p);
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} else {
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/* shrink */
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GC_PTR result =
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GC_generic_or_special_malloc((word)lb, obj_kind);
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if (result == 0) return(0);
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/* Could also return original object. But this */
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/* gives the client warning of imminent disaster. */
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BCOPY(p, result, lb);
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# ifndef IGNORE_FREE
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GC_free(p);
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# endif
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return(result);
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}
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} else {
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/* grow */
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GC_PTR result =
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GC_generic_or_special_malloc((word)lb, obj_kind);
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if (result == 0) return(0);
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BCOPY(p, result, sz);
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# ifndef IGNORE_FREE
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GC_free(p);
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# endif
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return(result);
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}
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}
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# if defined(REDIRECT_MALLOC) || defined(REDIRECT_REALLOC)
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# ifdef __STDC__
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GC_PTR realloc(GC_PTR p, size_t lb)
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# else
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GC_PTR realloc(p,lb)
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GC_PTR p;
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size_t lb;
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# endif
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{
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# ifdef REDIRECT_REALLOC
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return(REDIRECT_REALLOC(p, lb));
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# else
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return(GC_realloc(p, lb));
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# endif
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}
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# endif /* REDIRECT_MALLOC */
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/* The same thing, except caller does not hold allocation lock. */
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/* We avoid holding allocation lock while we clear memory. */
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ptr_t GC_generic_malloc_ignore_off_page(lb, k)
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register size_t lb;
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register int k;
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{
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register ptr_t result;
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word lw;
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word n_blocks;
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GC_bool init;
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DCL_LOCK_STATE;
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if (SMALL_OBJ(lb))
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return(GC_generic_malloc((word)lb, k));
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lw = ROUNDED_UP_WORDS(lb);
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n_blocks = OBJ_SZ_TO_BLOCKS(lw);
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init = GC_obj_kinds[k].ok_init;
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GC_INVOKE_FINALIZERS();
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DISABLE_SIGNALS();
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LOCK();
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result = (ptr_t)GC_alloc_large(lw, k, IGNORE_OFF_PAGE);
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if (0 != result) {
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if (GC_debugging_started) {
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BZERO(result, n_blocks * HBLKSIZE);
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} else {
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# ifdef THREADS
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/* Clear any memory that might be used for GC descriptors */
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/* before we release the lock. */
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((word *)result)[0] = 0;
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((word *)result)[1] = 0;
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((word *)result)[lw-1] = 0;
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((word *)result)[lw-2] = 0;
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# endif
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}
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}
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GC_words_allocd += lw;
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UNLOCK();
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ENABLE_SIGNALS();
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if (0 == result) {
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return((*GC_oom_fn)(lb));
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} else {
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if (init & !GC_debugging_started) {
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BZERO(result, n_blocks * HBLKSIZE);
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}
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return(result);
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}
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}
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# if defined(__STDC__) || defined(__cplusplus)
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void * GC_malloc_ignore_off_page(size_t lb)
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# else
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char * GC_malloc_ignore_off_page(lb)
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register size_t lb;
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# endif
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{
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return((GC_PTR)GC_generic_malloc_ignore_off_page(lb, NORMAL));
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}
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# if defined(__STDC__) || defined(__cplusplus)
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void * GC_malloc_atomic_ignore_off_page(size_t lb)
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# else
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char * GC_malloc_atomic_ignore_off_page(lb)
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register size_t lb;
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# endif
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{
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return((GC_PTR)GC_generic_malloc_ignore_off_page(lb, PTRFREE));
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}
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/* Increment GC_words_allocd from code that doesn't have direct access */
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/* to GC_arrays. */
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# ifdef __STDC__
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void GC_incr_words_allocd(size_t n)
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{
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GC_words_allocd += n;
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}
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/* The same for GC_mem_freed. */
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void GC_incr_mem_freed(size_t n)
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{
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GC_mem_freed += n;
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}
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# endif /* __STDC__ */
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/* Analogous to the above, but assumes a small object size, and */
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/* bypasses MERGE_SIZES mechanism. Used by gc_inline.h. */
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ptr_t GC_generic_malloc_words_small_inner(lw, k)
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register word lw;
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register int k;
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{
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register ptr_t op;
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register ptr_t *opp;
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register struct obj_kind * kind = GC_obj_kinds + k;
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opp = &(kind -> ok_freelist[lw]);
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if( (op = *opp) == 0 ) {
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if (!GC_is_initialized) {
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GC_init_inner();
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}
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if (kind -> ok_reclaim_list != 0 || GC_alloc_reclaim_list(kind)) {
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op = GC_clear_stack(GC_allocobj((word)lw, k));
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}
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if (op == 0) {
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UNLOCK();
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ENABLE_SIGNALS();
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return ((*GC_oom_fn)(WORDS_TO_BYTES(lw)));
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}
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}
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*opp = obj_link(op);
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obj_link(op) = 0;
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GC_words_allocd += lw;
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return((ptr_t)op);
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}
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/* Analogous to the above, but assumes a small object size, and */
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/* bypasses MERGE_SIZES mechanism. Used by gc_inline.h. */
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#ifdef __STDC__
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ptr_t GC_generic_malloc_words_small(size_t lw, int k)
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#else
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ptr_t GC_generic_malloc_words_small(lw, k)
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register word lw;
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register int k;
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#endif
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{
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register ptr_t op;
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DCL_LOCK_STATE;
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GC_INVOKE_FINALIZERS();
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DISABLE_SIGNALS();
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LOCK();
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op = GC_generic_malloc_words_small_inner(lw, k);
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UNLOCK();
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ENABLE_SIGNALS();
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return((ptr_t)op);
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}
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#if defined(THREADS) && !defined(SRC_M3)
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extern signed_word GC_mem_found; /* Protected by GC lock. */
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#ifdef PARALLEL_MARK
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volatile signed_word GC_words_allocd_tmp = 0;
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/* Number of words of memory allocated since */
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/* we released the GC lock. Instead of */
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/* reacquiring the GC lock just to add this in, */
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/* we add it in the next time we reacquire */
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/* the lock. (Atomically adding it doesn't */
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/* work, since we would have to atomically */
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/* update it in GC_malloc, which is too */
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/* expensive. */
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#endif /* PARALLEL_MARK */
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/* See reclaim.c: */
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extern ptr_t GC_reclaim_generic();
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/* Return a list of 1 or more objects of the indicated size, linked */
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/* through the first word in the object. This has the advantage that */
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/* it acquires the allocation lock only once, and may greatly reduce */
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/* time wasted contending for the allocation lock. Typical usage would */
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/* be in a thread that requires many items of the same size. It would */
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/* keep its own free list in thread-local storage, and call */
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/* GC_malloc_many or friends to replenish it. (We do not round up */
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/* object sizes, since a call indicates the intention to consume many */
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/* objects of exactly this size.) */
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/* We return the free-list by assigning it to *result, since it is */
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/* not safe to return, e.g. a linked list of pointer-free objects, */
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/* since the collector would not retain the entire list if it were */
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/* invoked just as we were returning. */
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/* Note that the client should usually clear the link field. */
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void GC_generic_malloc_many(lb, k, result)
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register word lb;
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register int k;
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ptr_t *result;
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{
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ptr_t op;
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ptr_t p;
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ptr_t *opp;
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word lw;
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word my_words_allocd = 0;
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struct obj_kind * ok = &(GC_obj_kinds[k]);
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DCL_LOCK_STATE;
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# if defined(GATHERSTATS) || defined(PARALLEL_MARK)
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# define COUNT_ARG , &my_words_allocd
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# else
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# define COUNT_ARG
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# define NEED_TO_COUNT
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# endif
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if (!SMALL_OBJ(lb)) {
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op = GC_generic_malloc(lb, k);
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if(0 != op) obj_link(op) = 0;
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*result = op;
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return;
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}
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lw = ALIGNED_WORDS(lb);
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GC_INVOKE_FINALIZERS();
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DISABLE_SIGNALS();
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LOCK();
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if (!GC_is_initialized) GC_init_inner();
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/* Do our share of marking work */
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if (GC_incremental && !GC_dont_gc) {
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ENTER_GC();
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GC_collect_a_little_inner(1);
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EXIT_GC();
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}
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/* First see if we can reclaim a page of objects waiting to be */
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/* reclaimed. */
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{
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struct hblk ** rlh = ok -> ok_reclaim_list;
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struct hblk * hbp;
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hdr * hhdr;
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rlh += lw;
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while ((hbp = *rlh) != 0) {
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hhdr = HDR(hbp);
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*rlh = hhdr -> hb_next;
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# ifdef PARALLEL_MARK
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{
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signed_word my_words_allocd_tmp = GC_words_allocd_tmp;
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GC_ASSERT(my_words_allocd_tmp >= 0);
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/* We only decrement it while holding the GC lock. */
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/* Thus we can't accidentally adjust it down in more */
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/* than one thread simultaneously. */
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if (my_words_allocd_tmp != 0) {
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(void)GC_atomic_add(
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(volatile GC_word *)(&GC_words_allocd_tmp),
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(GC_word)(-my_words_allocd_tmp));
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GC_words_allocd += my_words_allocd_tmp;
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}
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}
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GC_acquire_mark_lock();
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++ GC_fl_builder_count;
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UNLOCK();
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ENABLE_SIGNALS();
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GC_release_mark_lock();
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# endif
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op = GC_reclaim_generic(hbp, hhdr, lw,
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ok -> ok_init, 0 COUNT_ARG);
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if (op != 0) {
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# ifdef NEED_TO_COUNT
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/* We are neither gathering statistics, nor marking in */
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/* parallel. Thus GC_reclaim_generic doesn't count */
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/* for us. */
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for (p = op; p != 0; p = obj_link(p)) {
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my_words_allocd += lw;
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}
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# endif
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# if defined(GATHERSTATS)
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/* We also reclaimed memory, so we need to adjust */
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/* that count. */
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/* This should be atomic, so the results may be */
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/* inaccurate. */
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GC_mem_found += my_words_allocd;
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# endif
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# ifdef PARALLEL_MARK
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*result = op;
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(void)GC_atomic_add(
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(volatile GC_word *)(&GC_words_allocd_tmp),
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(GC_word)(my_words_allocd));
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GC_acquire_mark_lock();
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-- GC_fl_builder_count;
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if (GC_fl_builder_count == 0) GC_notify_all_builder();
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GC_release_mark_lock();
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(void) GC_clear_stack(0);
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return;
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# else
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GC_words_allocd += my_words_allocd;
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goto out;
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# endif
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}
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# ifdef PARALLEL_MARK
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GC_acquire_mark_lock();
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-- GC_fl_builder_count;
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if (GC_fl_builder_count == 0) GC_notify_all_builder();
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GC_release_mark_lock();
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DISABLE_SIGNALS();
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LOCK();
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/* GC lock is needed for reclaim list access. We */
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/* must decrement fl_builder_count before reaquiring GC */
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/* lock. Hopefully this path is rare. */
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# endif
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}
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}
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/* Next try to use prefix of global free list if there is one. */
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/* We don't refill it, but we need to use it up before allocating */
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/* a new block ourselves. */
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opp = &(GC_obj_kinds[k].ok_freelist[lw]);
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if ( (op = *opp) != 0 ) {
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*opp = 0;
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my_words_allocd = 0;
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for (p = op; p != 0; p = obj_link(p)) {
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my_words_allocd += lw;
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if (my_words_allocd >= BODY_SZ) {
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*opp = obj_link(p);
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obj_link(p) = 0;
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break;
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}
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}
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GC_words_allocd += my_words_allocd;
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goto out;
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}
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/* Next try to allocate a new block worth of objects of this size. */
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{
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struct hblk *h = GC_allochblk(lw, k, 0);
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if (h != 0) {
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if (IS_UNCOLLECTABLE(k)) GC_set_hdr_marks(HDR(h));
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GC_words_allocd += BYTES_TO_WORDS(HBLKSIZE)
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- BYTES_TO_WORDS(HBLKSIZE) % lw;
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# ifdef PARALLEL_MARK
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GC_acquire_mark_lock();
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++ GC_fl_builder_count;
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UNLOCK();
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ENABLE_SIGNALS();
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GC_release_mark_lock();
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# endif
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op = GC_build_fl(h, lw, ok -> ok_init, 0);
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# ifdef PARALLEL_MARK
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*result = op;
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GC_acquire_mark_lock();
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-- GC_fl_builder_count;
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if (GC_fl_builder_count == 0) GC_notify_all_builder();
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GC_release_mark_lock();
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(void) GC_clear_stack(0);
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return;
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# else
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goto out;
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# endif
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}
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}
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/* As a last attempt, try allocating a single object. Note that */
|
|
/* this may trigger a collection or expand the heap. */
|
|
op = GC_generic_malloc_inner(lb, k);
|
|
if (0 != op) obj_link(op) = 0;
|
|
|
|
out:
|
|
*result = op;
|
|
UNLOCK();
|
|
ENABLE_SIGNALS();
|
|
(void) GC_clear_stack(0);
|
|
}
|
|
|
|
GC_PTR GC_malloc_many(size_t lb)
|
|
{
|
|
ptr_t result;
|
|
GC_generic_malloc_many(lb, NORMAL, &result);
|
|
return result;
|
|
}
|
|
|
|
/* Note that the "atomic" version of this would be unsafe, since the */
|
|
/* links would not be seen by the collector. */
|
|
# endif
|
|
|
|
/* Allocate lb bytes of pointerful, traced, but not collectable data */
|
|
# ifdef __STDC__
|
|
GC_PTR GC_malloc_uncollectable(size_t lb)
|
|
# else
|
|
GC_PTR GC_malloc_uncollectable(lb)
|
|
size_t lb;
|
|
# endif
|
|
{
|
|
register ptr_t op;
|
|
register ptr_t *opp;
|
|
register word lw;
|
|
DCL_LOCK_STATE;
|
|
|
|
if( SMALL_OBJ(lb) ) {
|
|
# ifdef MERGE_SIZES
|
|
if (EXTRA_BYTES != 0 && lb != 0) lb--;
|
|
/* We don't need the extra byte, since this won't be */
|
|
/* collected anyway. */
|
|
lw = GC_size_map[lb];
|
|
# else
|
|
lw = ALIGNED_WORDS(lb);
|
|
# endif
|
|
opp = &(GC_uobjfreelist[lw]);
|
|
FASTLOCK();
|
|
if( FASTLOCK_SUCCEEDED() && (op = *opp) != 0 ) {
|
|
/* See above comment on signals. */
|
|
*opp = obj_link(op);
|
|
obj_link(op) = 0;
|
|
GC_words_allocd += lw;
|
|
/* Mark bit ws already set on free list. It will be */
|
|
/* cleared only temporarily during a collection, as a */
|
|
/* result of the normal free list mark bit clearing. */
|
|
GC_non_gc_bytes += WORDS_TO_BYTES(lw);
|
|
FASTUNLOCK();
|
|
return((GC_PTR) op);
|
|
}
|
|
FASTUNLOCK();
|
|
op = (ptr_t)GC_generic_malloc((word)lb, UNCOLLECTABLE);
|
|
} else {
|
|
op = (ptr_t)GC_generic_malloc((word)lb, UNCOLLECTABLE);
|
|
}
|
|
if (0 == op) return(0);
|
|
/* We don't need the lock here, since we have an undisguised */
|
|
/* pointer. We do need to hold the lock while we adjust */
|
|
/* mark bits. */
|
|
{
|
|
register struct hblk * h;
|
|
|
|
h = HBLKPTR(op);
|
|
lw = HDR(h) -> hb_sz;
|
|
|
|
DISABLE_SIGNALS();
|
|
LOCK();
|
|
GC_set_mark_bit(op);
|
|
GC_non_gc_bytes += WORDS_TO_BYTES(lw);
|
|
UNLOCK();
|
|
ENABLE_SIGNALS();
|
|
return((GC_PTR) op);
|
|
}
|
|
}
|
|
|
|
# ifdef ATOMIC_UNCOLLECTABLE
|
|
/* Allocate lb bytes of pointerfree, untraced, uncollectable data */
|
|
/* This is normally roughly equivalent to the system malloc. */
|
|
/* But it may be useful if malloc is redefined. */
|
|
# ifdef __STDC__
|
|
GC_PTR GC_malloc_atomic_uncollectable(size_t lb)
|
|
# else
|
|
GC_PTR GC_malloc_atomic_uncollectable(lb)
|
|
size_t lb;
|
|
# endif
|
|
{
|
|
register ptr_t op;
|
|
register ptr_t *opp;
|
|
register word lw;
|
|
DCL_LOCK_STATE;
|
|
|
|
if( SMALL_OBJ(lb) ) {
|
|
# ifdef MERGE_SIZES
|
|
if (EXTRA_BYTES != 0 && lb != 0) lb--;
|
|
/* We don't need the extra byte, since this won't be */
|
|
/* collected anyway. */
|
|
lw = GC_size_map[lb];
|
|
# else
|
|
lw = ALIGNED_WORDS(lb);
|
|
# endif
|
|
opp = &(GC_auobjfreelist[lw]);
|
|
FASTLOCK();
|
|
if( FASTLOCK_SUCCEEDED() && (op = *opp) != 0 ) {
|
|
/* See above comment on signals. */
|
|
*opp = obj_link(op);
|
|
obj_link(op) = 0;
|
|
GC_words_allocd += lw;
|
|
/* Mark bit was already set while object was on free list. */
|
|
GC_non_gc_bytes += WORDS_TO_BYTES(lw);
|
|
FASTUNLOCK();
|
|
return((GC_PTR) op);
|
|
}
|
|
FASTUNLOCK();
|
|
op = (ptr_t)GC_generic_malloc((word)lb, AUNCOLLECTABLE);
|
|
} else {
|
|
op = (ptr_t)GC_generic_malloc((word)lb, AUNCOLLECTABLE);
|
|
}
|
|
if (0 == op) return(0);
|
|
/* We don't need the lock here, since we have an undisguised */
|
|
/* pointer. We do need to hold the lock while we adjust */
|
|
/* mark bits. */
|
|
{
|
|
register struct hblk * h;
|
|
|
|
h = HBLKPTR(op);
|
|
lw = HDR(h) -> hb_sz;
|
|
|
|
DISABLE_SIGNALS();
|
|
LOCK();
|
|
GC_set_mark_bit(op);
|
|
GC_non_gc_bytes += WORDS_TO_BYTES(lw);
|
|
UNLOCK();
|
|
ENABLE_SIGNALS();
|
|
return((GC_PTR) op);
|
|
}
|
|
}
|
|
|
|
#endif /* ATOMIC_UNCOLLECTABLE */
|