зеркало из https://github.com/mozilla/pjs.git
368 строки
10 KiB
C
368 строки
10 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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*
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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 "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 * CONST GC_objfreelist_ptr = GC_objfreelist;
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ptr_t * CONST GC_aobjfreelist_ptr = GC_aobjfreelist;
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ptr_t * CONST GC_uobjfreelist_ptr = GC_uobjfreelist;
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# ifdef ATOMIC_UNCOLLECTABLE
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ptr_t * CONST GC_auobjfreelist_ptr = GC_auobjfreelist;
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# endif
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/* Allocate a composite object of size n bytes. The caller guarantees */
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/* that pointers past the first page are not relevant. Caller holds */
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/* allocation lock. */
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ptr_t GC_generic_malloc_inner_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 struct hblk * h;
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register word n_blocks;
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register word lw;
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register ptr_t op;
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if (lb <= HBLKSIZE)
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return(GC_generic_malloc_inner((word)lb, k));
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n_blocks = divHBLKSZ(ADD_SLOP(lb) + HDR_BYTES + HBLKSIZE-1);
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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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GC_collect_a_little_inner((int)n_blocks);
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lw = ROUNDED_UP_WORDS(lb);
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while ((h = GC_allochblk(lw, k, IGNORE_OFF_PAGE)) == 0
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&& GC_collect_or_expand(n_blocks, TRUE));
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if (h == 0) {
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op = 0;
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} else {
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op = (ptr_t) (h -> hb_body);
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GC_words_wasted += BYTES_TO_WORDS(n_blocks * HBLKSIZE) - lw;
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}
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GC_words_allocd += lw;
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return((ptr_t)op);
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}
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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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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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result = GC_generic_malloc_inner_ignore_off_page(lb,k);
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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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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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#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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register ptr_t *opp;
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register struct obj_kind * kind = GC_obj_kinds + k;
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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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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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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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/* 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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/* Note that the client should usually clear the link field. */
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ptr_t GC_generic_malloc_many(lb, k)
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register word lb;
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register int k;
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{
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ptr_t op;
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register ptr_t p;
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ptr_t *opp;
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word lw;
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register word my_words_allocd;
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DCL_LOCK_STATE;
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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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return(op);
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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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opp = &(GC_obj_kinds[k].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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op = GC_clear_stack(GC_allocobj(lw, k));
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if (op == 0) {
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UNLOCK();
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ENABLE_SIGNALS();
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op = (*GC_oom_fn)(lb);
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if(0 != op) obj_link(op) = 0;
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return(op);
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}
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}
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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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out:
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UNLOCK();
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ENABLE_SIGNALS();
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return(op);
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}
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void * GC_malloc_many(size_t lb)
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{
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return(GC_generic_malloc_many(lb, NORMAL));
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}
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/* Note that the "atomic" version of this would be unsafe, since the */
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/* links would not be seen by the collector. */
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# endif
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/* Allocate lb bytes of pointerful, traced, but not collectable data */
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# ifdef __STDC__
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GC_PTR GC_malloc_uncollectable(size_t lb)
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# else
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GC_PTR GC_malloc_uncollectable(lb)
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size_t lb;
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# endif
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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 word lw;
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DCL_LOCK_STATE;
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if( SMALL_OBJ(lb) ) {
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# ifdef MERGE_SIZES
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# ifdef ADD_BYTE_AT_END
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if (lb != 0) lb--;
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/* We don't need the extra byte, since this won't be */
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/* collected anyway. */
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# endif
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lw = GC_size_map[lb];
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# else
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lw = ALIGNED_WORDS(lb);
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# endif
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opp = &(GC_uobjfreelist[lw]);
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FASTLOCK();
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if( FASTLOCK_SUCCEEDED() && (op = *opp) != 0 ) {
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/* See above comment on signals. */
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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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/* Mark bit ws already set on free list. It will be */
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/* cleared only temporarily during a collection, as a */
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/* result of the normal free list mark bit clearing. */
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GC_non_gc_bytes += WORDS_TO_BYTES(lw);
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FASTUNLOCK();
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return((GC_PTR) op);
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}
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FASTUNLOCK();
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op = (ptr_t)GC_generic_malloc((word)lb, UNCOLLECTABLE);
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} else {
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op = (ptr_t)GC_generic_malloc((word)lb, UNCOLLECTABLE);
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}
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if (0 == op) return(0);
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/* We don't need the lock here, since we have an undisguised */
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/* pointer. We do need to hold the lock while we adjust */
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/* mark bits. */
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{
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register struct hblk * h;
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h = HBLKPTR(op);
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lw = HDR(h) -> hb_sz;
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DISABLE_SIGNALS();
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LOCK();
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GC_set_mark_bit(op);
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GC_non_gc_bytes += WORDS_TO_BYTES(lw);
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UNLOCK();
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ENABLE_SIGNALS();
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return((GC_PTR) op);
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}
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}
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# ifdef ATOMIC_UNCOLLECTABLE
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/* Allocate lb bytes of pointerfree, untraced, uncollectable data */
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/* This is normally roughly equivalent to the system malloc. */
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/* But it may be useful if malloc is redefined. */
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# ifdef __STDC__
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GC_PTR GC_malloc_atomic_uncollectable(size_t lb)
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# else
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GC_PTR GC_malloc_atomic_uncollectable(lb)
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size_t lb;
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# endif
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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 word lw;
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DCL_LOCK_STATE;
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if( SMALL_OBJ(lb) ) {
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# ifdef MERGE_SIZES
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# ifdef ADD_BYTE_AT_END
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if (lb != 0) lb--;
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/* We don't need the extra byte, since this won't be */
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/* collected anyway. */
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# endif
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lw = GC_size_map[lb];
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# else
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lw = ALIGNED_WORDS(lb);
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# endif
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opp = &(GC_auobjfreelist[lw]);
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FASTLOCK();
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if( FASTLOCK_SUCCEEDED() && (op = *opp) != 0 ) {
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/* See above comment on signals. */
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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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/* Mark bit was already set while object was on free list. */
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GC_non_gc_bytes += WORDS_TO_BYTES(lw);
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FASTUNLOCK();
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return((GC_PTR) op);
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}
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FASTUNLOCK();
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op = (ptr_t)GC_generic_malloc((word)lb, AUNCOLLECTABLE);
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} else {
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op = (ptr_t)GC_generic_malloc((word)lb, AUNCOLLECTABLE);
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}
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if (0 == op) return(0);
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/* We don't need the lock here, since we have an undisguised */
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/* pointer. We do need to hold the lock while we adjust */
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/* mark bits. */
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{
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register struct hblk * h;
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h = HBLKPTR(op);
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lw = HDR(h) -> hb_sz;
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DISABLE_SIGNALS();
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LOCK();
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GC_set_mark_bit(op);
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GC_non_gc_bytes += WORDS_TO_BYTES(lw);
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UNLOCK();
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ENABLE_SIGNALS();
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return((GC_PTR) op);
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}
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}
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#endif /* ATOMIC_UNCOLLECTABLE */
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