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/*
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* Copyright (c) 2011 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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#include "private/gc_priv.h"
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#ifdef ENABLE_DISCLAIM
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#include "gc_disclaim.h"
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#include "gc_inline.h" /* for GC_malloc_kind */
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STATIC int GC_finalized_kind = 0;
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#if defined(KEEP_BACK_PTRS) || defined(MAKE_BACK_GRAPH)
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/* The first bit is already used for a debug purpose. */
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# define FINALIZER_CLOSURE_FLAG 0x2
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#else
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# define FINALIZER_CLOSURE_FLAG 0x1
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#endif
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STATIC int GC_CALLBACK GC_finalized_disclaim(void *obj)
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{
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word fc_word = *(word *)obj;
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if ((fc_word & FINALIZER_CLOSURE_FLAG) != 0) {
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/* The disclaim function may be passed fragments from the */
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/* free-list, on which it should not run finalization. */
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/* To recognize this case, we use the fact that the first word */
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/* on such fragments is always multiple of 4 (a link to the next */
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/* fragment, or NULL). If it is desirable to have a finalizer */
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/* which does not use the first word for storing finalization */
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/* info, GC_reclaim_with_finalization must be extended to clear */
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/* fragments so that the assumption holds for the selected word. */
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const struct GC_finalizer_closure *fc
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= (void *)(fc_word & ~(word)FINALIZER_CLOSURE_FLAG);
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(*fc->proc)((word *)obj + 1, fc->cd);
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}
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return 0;
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}
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static GC_bool done_init = FALSE;
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GC_API void GC_CALL GC_init_finalized_malloc(void)
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{
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DCL_LOCK_STATE;
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GC_init(); /* In case it's not already done. */
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LOCK();
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if (done_init) {
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UNLOCK();
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return;
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}
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done_init = TRUE;
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/* The finalizer closure is placed in the first word in order to */
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/* use the lower bits to distinguish live objects from objects on */
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/* the free list. The downside of this is that we need one-word */
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/* offset interior pointers, and that GC_base does not return the */
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/* start of the user region. */
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GC_register_displacement_inner(sizeof(word));
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GC_finalized_kind = GC_new_kind_inner(GC_new_free_list_inner(),
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GC_DS_LENGTH, TRUE, TRUE);
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GC_register_disclaim_proc(GC_finalized_kind, GC_finalized_disclaim, TRUE);
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UNLOCK();
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}
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GC_API void GC_CALL GC_register_disclaim_proc(int kind, GC_disclaim_proc proc,
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int mark_unconditionally)
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{
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GC_ASSERT((unsigned)kind < MAXOBJKINDS);
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GC_obj_kinds[kind].ok_disclaim_proc = proc;
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GC_obj_kinds[kind].ok_mark_unconditionally = (GC_bool)mark_unconditionally;
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}
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GC_API GC_ATTR_MALLOC void * GC_CALL GC_finalized_malloc(size_t lb,
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const struct GC_finalizer_closure *fclos)
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{
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word *op;
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GC_ASSERT(done_init);
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op = GC_malloc_kind(SIZET_SAT_ADD(lb, sizeof(word)), GC_finalized_kind);
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if (EXPECT(NULL == op, FALSE))
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return NULL;
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*op = (word)fclos | FINALIZER_CLOSURE_FLAG;
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return op + 1;
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}
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#endif /* ENABLE_DISCLAIM */
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