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authorLukas Larsson <lukas@erlang-solutions.com>2012-06-04 11:51:03 +0200
committerLukas Larsson <lukas@erlang-solutions.com>2012-06-04 11:59:03 +0200
commit0374be0e7caf06a9d1af3daef2cea1f7b20a57ab (patch)
tree23385b33daa358eaf0a7dc290257f82207d412c9 /erts/emulator/beam/erl_nmgc.c
parent868f5446c1f133cc29fc2ef274697460886374c6 (diff)
parent9cfeeb9b7e66a3345cbc0e5b4b634cb5965635fc (diff)
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Merge branch 'maint'
* maint: Remove stale code for hybrid heap and incremental GC Remove the hipe_bifs:show_message_area/0 BIF Remove support for erlang:system_info(global_heaps_size) Remove the erlang:garbage_collect_message_area/0 BIF Remove workarounds for hybrid and shared heaps in test suites Conflicts: erts/doc/src/erlang.xml erts/emulator/beam/erl_message.c erts/emulator/beam/erl_process.c erts/emulator/beam/erl_process.h erts/emulator/hipe/hipe_bif2.tab lib/hipe/cerl/erl_bif_types.erl
Diffstat (limited to 'erts/emulator/beam/erl_nmgc.c')
-rw-r--r--erts/emulator/beam/erl_nmgc.c1401
1 files changed, 0 insertions, 1401 deletions
diff --git a/erts/emulator/beam/erl_nmgc.c b/erts/emulator/beam/erl_nmgc.c
deleted file mode 100644
index 2a8c819360..0000000000
--- a/erts/emulator/beam/erl_nmgc.c
+++ /dev/null
@@ -1,1401 +0,0 @@
-/*
- * %CopyrightBegin%
- *
- * Copyright Ericsson AB 2004-2011. All Rights Reserved.
- *
- * The contents of this file are subject to the Erlang Public License,
- * Version 1.1, (the "License"); you may not use this file except in
- * compliance with the License. You should have received a copy of the
- * Erlang Public License along with this software. If not, it can be
- * retrieved online at http://www.erlang.org/.
- *
- * Software distributed under the License is distributed on an "AS IS"
- * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
- * the License for the specific language governing rights and limitations
- * under the License.
- *
- * %CopyrightEnd%
- */
-
-#ifdef HAVE_CONFIG_H
-# include "config.h"
-#endif
-#include "global.h"
-#include "erl_gc.h"
-#include "erl_binary.h"
-#include "erl_nmgc.h"
-#include "erl_debug.h"
-#if HIPE
-#include "hipe_stack.h"
-#endif
-
-
-#ifdef INCREMENTAL
-/***************************************************************************
- * *
- * Incremental Garbage Collector for the Message Area *
- * *
- ***************************************************************************/
-
-/*
- * The heap pointers are declared in erl_init.c
- * global_heap is the nursery
- * global_old_heap is the old generation
- */
-unsigned char *blackmap = NULL;
-INC_Page *inc_used_mem = NULL;
-INC_MemBlock *inc_free_list = NULL;
-Eterm *inc_fromspc;
-Eterm *inc_fromend;
-Eterm *inc_nursery_scn_ptr;
-Eterm **fwdptrs;
-Eterm *inc_alloc_limit;
-Process *inc_active_proc;
-Process *inc_active_last;
-int inc_words_to_go;
-
-static Eterm *inc_last_nursery;
-static int inc_pages = INC_NoPAGES;
-static INC_Page *inc_bibop = NULL;
-static int inc_used_pages;
-
-/* Used when growing the old generation */
-/*
-#define INC_ROOTSAVE 16384
-static Eterm *root_save[INC_ROOTSAVE];
-static int roots_saved = 0;
-*/
-
-INC_STORAGE_DECLARATION(,gray);
-
-static void inc_minor_gc(Process *p, int need, Eterm* objv, int nobj);
-static void inc_major_gc(Process *p, int need, Eterm* objv, int nobj);
-
-#ifdef INC_TIME_BASED
-#if USE_PERFCTR
-
-/*
- * This uses the Linux perfctr extension to virtualise the
- * time-stamp counter.
- */
-#include "libperfctr.h"
-static struct vperfctr *vperfctr;
-static double cpu_khz;
-static double tsc_to_cpu_mult;
-
-static void inc_start_hrvtime(void)
-{
- struct perfctr_info info;
- struct vperfctr_control control;
-
- if( vperfctr != NULL )
- return;
- vperfctr = vperfctr_open();
- if( vperfctr == NULL )
- return;
- if( vperfctr_info(vperfctr, &info) >= 0 ) {
- cpu_khz = (double)info.cpu_khz;
- tsc_to_cpu_mult = (double)(info.tsc_to_cpu_mult ? : 1);
- if( info.cpu_features & PERFCTR_FEATURE_RDTSC ) {
- memset(&control, 0, sizeof control);
- control.cpu_control.tsc_on = 1;
- if( vperfctr_control(vperfctr, &control) >= 0 )
- return;
- }
- }
- vperfctr_close(vperfctr);
- vperfctr = NULL;
-}
-
-#define inc_get_hrvtime() (((double)vperfctr_read_tsc(vperfctr) * tsc_to_cpu_mult) / cpu_khz)
-
-#endif /* USE_PERFCTR */
-#endif /* INC_TIME_BASED */
-
-#ifdef INC_TIME_BASED
-# define timeslice 1 /* milli seconds */
-# define WORK_MORE (inc_get_hrvtime() < start_time + timeslice)
-#else
-//# define inc_min_work 100 /* words */
-# define inc_min_work global_heap_sz + inc_pages * INC_FULLPAGE /* words */
-# define WORK_MORE (inc_words_to_go > 0)
-#endif
-
-void erts_init_incgc(void)
-{
- int i;
- int size = inc_pages * INC_FULLPAGE;
-
- /* Young generation */
- global_heap = (Eterm *)erts_alloc(ERTS_ALC_T_MESSAGE_AREA,
- sizeof(Eterm) * global_heap_sz);
- global_hend = global_heap + global_heap_sz;
- global_htop = global_heap;
- inc_alloc_limit = global_hend;
-
- /* Fromspace */
- inc_last_nursery = (Eterm *) erts_alloc(ERTS_ALC_T_MESSAGE_AREA,
- global_heap_sz * sizeof(Eterm));
- inc_fromspc = inc_fromend = NULL;
-
- /* Forward-pointers */
- fwdptrs = erts_alloc(ERTS_ALC_T_MESSAGE_AREA,
- global_heap_sz * sizeof(Eterm*));
- /* Old generation */
- global_old_heap = (Eterm *)erts_alloc(ERTS_ALC_T_MESSAGE_AREA,
- size * sizeof(Eterm));
- global_old_hend = global_old_heap + size;
-
- /* Pages i BiBOP */
- for (i = 0; i < inc_pages; i++)
- {
- INC_Page *this = (INC_Page*)(global_old_heap + i * INC_FULLPAGE);
- this->next = (INC_Page*)((Eterm*)this + INC_FULLPAGE);
- }
-
- inc_bibop = (INC_Page*)global_old_heap;
- ((INC_Page*)(global_old_heap + (inc_pages - 1) * INC_FULLPAGE))->next =
- NULL;
-
- inc_used_mem = inc_bibop;
- inc_bibop = inc_bibop->next;
- inc_used_mem->next = NULL;
- inc_used_pages = 1;
-
- /* Free-list */
- inc_free_list = (INC_MemBlock*)inc_used_mem->start;
- inc_free_list->size = INC_PAGESIZE;
- inc_free_list->prev = NULL;
- inc_free_list->next = NULL;
-
- /* Blackmap */
- blackmap = (unsigned char*)erts_alloc(ERTS_ALC_T_MESSAGE_AREA,
- INC_FULLPAGE * inc_pages);
- /* Gray stack */
- INC_STORAGE_INIT(gray);
-
- inc_active_proc = NULL;
- inc_active_last = NULL;
-
-#ifdef INC_TIME_BASED
- inc_start_hrvtime();
-#endif
-}
-
-void erts_cleanup_incgc(void)
-{
- INC_STORAGE_ERASE(gray);
-
- if (inc_fromspc)
- inc_last_nursery = inc_fromspc;
-
- erts_free(ERTS_ALC_T_MESSAGE_AREA,(void*)global_heap);
- erts_free(ERTS_ALC_T_MESSAGE_AREA,(void*)inc_last_nursery);
- erts_free(ERTS_ALC_T_MESSAGE_AREA,(void*)global_old_heap);
- erts_free(ERTS_ALC_T_MESSAGE_AREA,(void*)blackmap);
- erts_free(ERTS_ALC_T_MESSAGE_AREA,(void*)fwdptrs);
-}
-
-void erts_incremental_gc(Process* p, int need, Eterm* objv, int nobj)
-{
- int repeat_minor;
-#ifdef INC_TIME_BASED
- double start_time = inc_get_hrvtime();
- int work_left_before = inc_words_to_go;
-#endif
- /* Used when growing the fromspace */
- static char inc_growing_nurs = 0;
-
- BM_STOP_TIMER(system);
- //BM_MMU_READ();
- BM_RESET_TIMER(gc);
- BM_START_TIMER(gc);
-
- VERBOSE(DEBUG_HYBRID_GC,
- ("INCGC: Incremental GC START Caused by: %T Need: %d\n",
- p->id,need));
-
- ma_gc_flags |= GC_GLOBAL;
- ma_gc_flags &= ~GC_CYCLE_START;
-
-#ifndef INC_TIME_BASED
- /* Decide how much work to do this GC stage. The work is meassured
- * in number of words copied from the young generation to the old
- * plus number of work marked in the old generation.
- */
- if (ma_gc_flags & GC_MAJOR) {
- int wm = (need > inc_min_work) ? need : inc_min_work;
- inc_words_to_go = (int)((wm * (((inc_used_pages * INC_PAGESIZE) /
- (double)global_heap_sz) + 1)) + 0.5);
- }
- else
- inc_words_to_go = (need > inc_min_work) ? need : inc_min_work;
-#endif
-
- do {
- if (ma_gc_flags & GC_MAJOR) {
- /* This is a major collection cycle. */
- inc_major_gc(p,need,objv,nobj);
- } else if (ma_gc_flags & GC_CYCLE) {
- /* This is a minor collection cycle. */
- inc_minor_gc(p,need,objv,nobj);
- } else {
- VERBOSE(DEBUG_HYBRID_GC,("INCGC: Collection cycle START\n"));
- ma_gc_flags |= (GC_CYCLE | GC_CYCLE_START);
- inc_fromspc = global_heap;
- inc_fromend = global_htop;
- global_heap = global_htop = inc_last_nursery;
- global_hend = global_heap + global_heap_sz;
- inc_nursery_scn_ptr = global_heap;
-#ifdef INC_TIME_BASED
- work_left_before = inc_words_to_go = global_heap_sz;
-#endif
-#ifdef DEBUG
- inc_last_nursery = NULL;
-#endif
- memset(fwdptrs,0,global_heap_sz * sizeof(Eterm));
-
- {
- /* TODO: Alla processer ska v�l egentligen inte aktiveras h�r... */
- int i;
- for (i = 0; i < erts_num_active_procs; i++) {
- Process *cp = erts_active_procs[i];
- INC_ACTIVATE(cp);
- cp->scan_top = cp->high_water;
- }
- }
-
- if (ma_gc_flags & GC_NEED_MAJOR) {
- /* The previous collection cycle caused the old generation to
- * overflow. This collection cycle will therefore be a major
- * one.
- */
- BM_COUNT(major_gc_cycles);
- VERBOSE(DEBUG_HYBRID_GC,("INCGC: MAJOR cycle\n"));
- inc_major_gc(p,need,objv,nobj);
- } else {
- BM_COUNT(minor_gc_cycles);
- VERBOSE(DEBUG_HYBRID_GC,("INCGC: MINOR cycle\n"));
- inc_minor_gc(p,need,objv,nobj);
- }
- }
-
- repeat_minor = 0;
- if (!(ma_gc_flags & GC_CYCLE)) {
- inc_alloc_limit = global_hend;
- inc_last_nursery = inc_fromspc;
- inc_fromspc = inc_fromend = NULL;
- ASSERT(INC_STORAGE_EMPTY(gray));
-
- if (inc_growing_nurs) {
- /*
- * The previous collection cycle caused the nursery to
- * grow, now we have to grow the from-space as well.
- */
- inc_last_nursery =
- (Eterm*) erts_realloc(ERTS_ALC_T_MESSAGE_AREA,
- (void*)inc_last_nursery,
- sizeof(Eterm) * global_heap_sz);
- inc_growing_nurs = 0;
- }
-
- if (global_hend - global_htop <= need) {
- /*
- * Initiate a new GC cycle immediately and, if necessary,
- * enlarge the nursery.
- */
- if (global_heap_sz <= need) {
- VERBOSE(DEBUG_HYBRID_GC,
- ("INCGC: Allocating a larger nursery\n"));
- global_heap_sz = erts_next_heap_size(need * 1.5,0);
- inc_last_nursery =
- (Eterm*) erts_realloc(ERTS_ALC_T_MESSAGE_AREA,
- (void*)inc_last_nursery,
- sizeof(Eterm) * global_heap_sz);
- fwdptrs = erts_realloc(ERTS_ALC_T_MESSAGE_AREA,fwdptrs,
- global_heap_sz * sizeof(Eterm*));
- inc_growing_nurs = 1;
- }
- repeat_minor = 1;
- }
-
-#ifdef DEBUG
- /* Fill the from-space with bad things */
- memset(inc_last_nursery,DEBUG_BAD_BYTE,
- global_heap_sz * sizeof(Eterm));
-#endif
- }
- } while (repeat_minor);
-
-
- /* Clean up after garbage collection ********************************/
-
- if (inc_alloc_limit != global_hend) {
-
-#ifdef INC_TIME_BASED
- if ((work_left_before - inc_words_to_go) == 0) {
- inc_alloc_limit = global_htop + need;
- } else {
- inc_alloc_limit = (global_hend - global_htop) /
- (inc_words_to_go / (work_left_before - inc_words_to_go)) +
- global_htop;
- if (inc_alloc_limit > global_hend)
- inc_alloc_limit = global_hend;
- }
-#else
- inc_alloc_limit = (Eterm*)(global_htop + (need > inc_min_work) ?
- need : inc_min_work);
- if (inc_alloc_limit > global_hend)
- inc_alloc_limit = global_hend;
-#endif
- }
-
- ma_gc_flags &= ~GC_GLOBAL;
-
- /* INC_TIME_BASED: If this fails we have to increase the timeslice! */
- ASSERT(inc_alloc_limit - global_htop > need);
-
- BM_STOP_TIMER(gc);
-#ifdef BM_TIMERS
- minor_global_gc_time += gc_time;
- if (gc_time > max_global_minor_time)
- max_global_minor_time = gc_time;
-
- pause_times[(((gc_time * 1000) < MAX_PAUSE_TIME) ?
- (int)(gc_time * 1000) :
- MAX_PAUSE_TIME - 1)]++;
-#endif
- //BM_MMU_INIT();
- { static long long verif = 0;
- //erts_printf("innan verify: %d\n",++verif);
- if (verif==168) print_memory(NULL);
- verify_everything();
- //erts_printf("efter verify: %d\n",verif);
- }
- BM_START_TIMER(system);
- VERBOSE(DEBUG_HYBRID_GC,("INCGC: Incremental GC END\n"));
-}
-
-
-/***************************************************************************
- * *
- * Minor collection - Copy live data from young generation to old *
- * *
- ***************************************************************************/
-
-#define MINOR_SCAN(PTR,END) do { \
- ASSERT(PTR <= END); \
- while (WORK_MORE && PTR < END) { \
- Eterm val = *PTR; \
- Eterm *obj_ptr = ptr_val(val); \
- switch (primary_tag(val)) { \
- case TAG_PRIMARY_LIST: \
- if (ptr_within(obj_ptr,inc_fromspc,inc_fromend)) { \
- if (INC_IS_FORWARDED(obj_ptr)) { \
- *PTR = make_list(INC_FORWARD_VALUE(obj_ptr)); \
- } \
- else { \
- Eterm *hp = erts_inc_alloc(2); \
- INC_STORE(gray,hp,2); \
- INC_COPY_CONS(obj_ptr,hp,PTR); \
- } \
- } \
- break; \
- case TAG_PRIMARY_BOXED: \
- if (ptr_within(obj_ptr,inc_fromspc,inc_fromend)) { \
- if (INC_IS_FORWARDED(obj_ptr)) { \
- *PTR = make_boxed(INC_FORWARD_VALUE(obj_ptr)); \
- } \
- else { \
- Eterm *hp = erts_inc_alloc(BOXED_NEED(obj_ptr,*obj_ptr)); \
- INC_STORE(gray,hp,BOXED_NEED(obj_ptr,*obj_ptr)); \
- INC_COPY_BOXED(obj_ptr,hp,PTR); \
- } \
- } \
- break; \
- case TAG_PRIMARY_HEADER: \
- switch (val & _TAG_HEADER_MASK) { \
- case ARITYVAL_SUBTAG: break; \
- default: PTR += thing_arityval(val); break; \
- } \
- break; \
- } \
- PTR++; \
- } \
-} while(0)
-
-
-/* Returns: TRUE (1) if the need is greater than the available space
- * and the garbage collector needs to be restarted immediately. FALSE
- * (0) otherwise.
- */
-static void inc_minor_gc(Process* p, int need, Eterm* objv, int nobj)
-{
- BM_COUNT(minor_gc_stages);
-
- /* Start with looking at gray objects found in earlier collection
- * stages.
- */
- VERBOSE(DEBUG_HYBRID_GC,("INCGC: Rescue gray found from nursery\n"));
- {
- INC_Object *obj = NULL;
- Eterm *ptr;
-
- while (WORK_MORE && !INC_STORAGE_EMPTY(gray)) {
- obj = INC_STORAGE_GET(gray);
- if ((*obj->this & _TAG_HEADER_MASK) == FUN_SUBTAG) {
- ptr = obj->this + thing_arityval(*obj->this) + 1;
- } else {
- ptr = obj->this;
- }
- MINOR_SCAN(ptr,obj->this + obj->size);
- }
- /* TODO: Se f�reg�ende uppdatering av gr� objekt */
- if (!WORK_MORE && obj != NULL)
- INC_STORE(gray,obj->this,obj->size);
- }
-
- VERBOSE(DEBUG_HYBRID_GC,("INCGC: Scan root-set\n"));
- while (WORK_MORE && inc_active_proc) {
- Rootset rootset;
- Process *cp = inc_active_proc;
-
- ASSERT(INC_IS_ACTIVE(cp));
-
- /* TODO: Hur dyrt �r det att bygga nytt rootset varje g�ng? */
-
- /* TODO: Fundera p� ordningen! Rootset, Heap, Old heap... */
-
- /* TODO: Scanna stacken fr�n p->send till p->stop! [Brooks84] */
- /* Notera: Vi GC:ar inte de yngsta objekten - de som allokeras
- under GC-cykeln. Detta ger ynglingarna en chans att d� innan
- GC:n b�rjar kopiera dem. [StefanovicMcKinleyMoss@OOPSLA99] */
-
- /* TODO: N�r rootset �r scannat borde processen inte vara
- aktiv mer. Den b�r aktiveras i schedule, endast om en
- process har k�rt beh�ver vi scanna rootset igen. */
-
- /* MT: In a multithreaded system the process cp needs to be
- * locked here.
- */
-
- if (cp == p)
- rootset.n = setup_rootset(cp, objv, nobj, &rootset);
- else
- rootset.n = setup_rootset(cp, cp->arg_reg, cp->arity, &rootset);
-
- //MA_GENSWEEP_NSTACK(cp, old_htop, n_htop, objv, nobj);
-
- while (WORK_MORE && rootset.n--) {
- Eterm *g_ptr = rootset.v[rootset.n];
- Uint g_sz = rootset.sz[rootset.n];
-
- while (WORK_MORE && g_sz--) {
- Eterm gval = *g_ptr;
- switch (primary_tag(gval)) {
- case TAG_PRIMARY_LIST: {
- Eterm *ptr = list_val(gval);
- if (ptr_within(ptr,inc_fromspc,inc_fromend)) {
- if (INC_IS_FORWARDED(ptr)) {
- *g_ptr++ = make_list(INC_FORWARD_VALUE(ptr));
- }
- else {
- Eterm *hp = erts_inc_alloc(2);
- INC_STORE(gray,hp,2);
- INC_COPY_CONS(ptr,hp,g_ptr++);
- }
- }
- else
- ++g_ptr;
- continue;
- }
-
- case TAG_PRIMARY_BOXED: {
- Eterm *ptr = boxed_val(gval);
- if (ptr_within(ptr,inc_fromspc,inc_fromend)) {
- if (INC_IS_FORWARDED(ptr)) {
- *g_ptr++ = make_boxed(INC_FORWARD_VALUE(ptr));
- }
- else {
- Eterm *hp = erts_inc_alloc(BOXED_NEED(ptr,*ptr));
- INC_STORE(gray,hp,BOXED_NEED(ptr,*ptr));
- INC_COPY_BOXED(ptr,hp,g_ptr++);
- }
- }
- else
- ++g_ptr;
- continue;
- }
-
- default:
- g_ptr++;
- continue;
- }
- }
- }
-
- restore_one_rootset(cp, &rootset);
-
- /* MT: cp can be unlocked now. */
-
- /* VERBOSE(DEBUG_HYBRID_GC,("INCGC: Scan private nursery\n")); */
- if (cp->scan_top != HEAP_TOP(cp)) {
- Eterm *ptr = cp->scan_top;
- MINOR_SCAN(ptr,HEAP_TOP(cp));
- /* TODO: F�r att spara scan_top h�r m�ste alla ma-pekare
- * som hittas l�ggas till i cp->rrma.
- */
- //cp->scan_top = ptr;
- }
-
- /* VERBOSE(DEBUG_HYBRID_GC,("INCGC: Scan heap fragments\n")); */
- {
- ErlHeapFragment* bp = MBUF(cp);
-
- while (WORK_MORE && bp) {
- Eterm *ptr = bp->mem;
- if ((ARITH_HEAP(cp) >= bp->mem) &&
- (ARITH_HEAP(cp) < bp->mem + bp->size)) {
- MINOR_SCAN(ptr,ARITH_HEAP(cp));
- } else {
- MINOR_SCAN(ptr,bp->mem + bp->size);
- }
- bp = bp->next;
- }
- }
-
- /* VERBOSE(DEBUG_HYBRID_GC,("INCGC: Scan gray\n")); */
- {
- INC_Object *obj = NULL;
- Eterm *ptr;
- while (WORK_MORE && !INC_STORAGE_EMPTY(gray)) {
- obj = INC_STORAGE_GET(gray);
- if ((*obj->this & _TAG_HEADER_MASK) == FUN_SUBTAG) {
- ptr = obj->this + thing_arityval(*obj->this) + 1;
- } else {
- ptr = obj->this;
- }
- MINOR_SCAN(ptr,obj->this + obj->size);
- }
- /* TODO: INC_STORE(gray,ptr,obj->size-(ptr-obj->this)); Typ.. */
- if (!WORK_MORE && obj != NULL)
- INC_STORE(gray,obj->this,obj->size);
- }
-
- if (WORK_MORE) {
- //printf("Rootset after:\r\n");
- //print_one_rootset(&rootset);
- INC_DEACTIVATE(cp);
- }
- }
-
- /* Update new pointers in the nursery to new copies in old generation. */
- VERBOSE(DEBUG_HYBRID_GC,("INCGC: Update nursery\n"));
- {
- Eterm *ptr = inc_nursery_scn_ptr;
- MINOR_SCAN(ptr,global_htop);
- inc_nursery_scn_ptr = ptr;
- }
-
- VERBOSE(DEBUG_HYBRID_GC,("INCGC: Rescue gray found from nursery\n"));
- {
- INC_Object *obj = NULL;
- Eterm *ptr;
-
- while (WORK_MORE && !INC_STORAGE_EMPTY(gray)) {
- obj = INC_STORAGE_GET(gray);
- if ((*obj->this & _TAG_HEADER_MASK) == FUN_SUBTAG) {
- ptr = obj->this + thing_arityval(*obj->this) + 1;
- } else {
- ptr = obj->this;
- }
- MINOR_SCAN(ptr,obj->this + obj->size);
- }
- /* TODO: Se f�reg�ende uppdatering av gr� objekt */
- if (!WORK_MORE && obj != NULL)
- INC_STORE(gray,obj->this,obj->size);
- }
-
- /* Atomic phase */
- VERBOSE(DEBUG_HYBRID_GC,("INCGC: Update copy stack\n"));
- {
- Uint i;
- for (i = 0; i < ma_dst_top; i++) {
- if (ptr_within(ma_dst_stack[i],inc_fromspc,inc_fromend)) {
- if (INC_IS_FORWARDED(ma_dst_stack[i]))
- ma_dst_stack[i] = INC_FORWARD_VALUE(ma_dst_stack[i]);
- }
- }
- }
-
- if (WORK_MORE) {
- VERBOSE(DEBUG_HYBRID_GC,("INCGC: Update offheap-lists\n"));
- {
- ExternalThing **prev = &erts_global_offheap.externals;
- ExternalThing *ptr = erts_global_offheap.externals;
-
- /* Atomic phase */
- VERBOSE(DEBUG_HYBRID_GC,("INCGC: Sweep proc externals\n"));
- while (ptr) {
- Eterm *ppt = (Eterm*) ptr;
-
- if (ptr_within(ppt,global_old_heap,global_old_hend)) {
- prev = &ptr->next;
- ptr = ptr->next;
- } else if (ptr_within(ppt, inc_fromspc, inc_fromend) &&
- INC_IS_FORWARDED(ppt)) {
- ExternalThing *ro = (ExternalThing*)INC_FORWARD_VALUE(ppt);
- *prev = ro; /* Patch to moved pos */
- prev = &ro->next;
- ptr = ro->next;
- } else {
- erts_deref_node_entry(ptr->node);
- *prev = ptr = ptr->next;
- }
- }
- ASSERT(*prev == NULL);
- }
-
- {
- ProcBin **prev = &erts_global_offheap.mso;
- ProcBin *ptr = erts_global_offheap.mso;
-
- /* Atomic phase */
- VERBOSE(DEBUG_HYBRID_GC,("INCGC: Sweep proc bins\n"));
- while (ptr) {
- Eterm *ppt = (Eterm*)ptr;
-
- if (ptr_within(ppt,global_old_heap,global_old_hend)) {
- prev = &ptr->next;
- ptr = ptr->next;
- } else if (ptr_within(ppt, inc_fromspc, inc_fromend) &&
- INC_IS_FORWARDED(ppt)) {
- ProcBin *ro = (ProcBin*)INC_FORWARD_VALUE(ppt);
- *prev = ro; /* Patch to moved pos */
- prev = &ro->next;
- ptr = ro->next;
- } else {
- Binary *bptr;
- *prev = ptr->next;
- bptr = ptr->val;
- if (erts_refc_dectest(&bptr->refc, 0) == 0)
- erts_bin_free(bptr);
- ptr = *prev;
- }
- }
- ASSERT(*prev == NULL);
- }
-
- VERBOSE(DEBUG_HYBRID_GC,("INCGC: Minor collection cycle END\n"));
- ma_gc_flags &= ~GC_CYCLE;
- }
-}
-
-
-
-
-/***************************************************************************
- * *
- * Major collection - CopyMark - Copy young to old, Mark-Sweep old *
- * *
- ***************************************************************************/
-
-#define COPYMARK(PTR,END) do { \
- ASSERT(PTR <= END); \
- while (WORK_MORE && PTR < END) { \
- Eterm val = *PTR; \
- Eterm *obj_ptr = ptr_val(val); \
- switch (primary_tag(val)) { \
- case TAG_PRIMARY_LIST: \
- COPYMARK_CONS(obj_ptr,aging_htop,PTR,aging_end); break; \
- case TAG_PRIMARY_BOXED: \
- COPYMARK_BOXED(obj_ptr,aging_htop,PTR,aging_end); break; \
- case TAG_PRIMARY_HEADER: \
- switch (val & _TAG_HEADER_MASK) { \
- case ARITYVAL_SUBTAG: break; \
- default: \
- PTR += thing_arityval(val); \
- break; \
- } \
- break; \
- default: break; \
- } \
- PTR++; \
- } \
-} while(0);
-/* TODO:
- if (aging_htop + 10 > aging + INC_FULLPAGE) {
- aging->next = inc_used_mem;
- inc_used_mem = aging;
- }
-*/
-
-static void inc_major_gc(Process *p, int need, Eterm* objv, int nobj)
-{
- Eterm *free_start = NULL;
- Uint live = 0;
- Uint old_gen_sz = 0;
- static INC_Page *aging;
- static Eterm *aging_htop;
- static Eterm *aging_end;
- BM_NEW_TIMER(old_gc);
-
- BM_SWAP_TIMER(gc,old_gc);
- BM_COUNT(major_gc_stages);
-
- VERBOSE(DEBUG_HYBRID_GC,("INCGC: Major collection START\n"));
-
- ma_gc_flags |= GC_INCLUDE_ALL;
-
- if (ma_gc_flags & GC_NEED_MAJOR)
- {
- INC_Page *page = inc_used_mem;
-
- ma_gc_flags |= GC_MAJOR;
- ma_gc_flags &= ~GC_NEED_MAJOR;
-
- while (page)
- {
- memset(blackmap +
- ((void*)page - (void*)global_old_heap) / sizeof(void*),
- 0, INC_FULLPAGE);
- page = page->next;
- }
-
- if (inc_bibop) {
- aging = inc_bibop;
- inc_bibop = inc_bibop->next;
- aging->next = NULL;
- memset(blackmap +
- ((void*)aging - (void*)global_old_heap) / sizeof(void*),
- 1, INC_FULLPAGE);
- aging_htop = aging->start;
- aging_end = aging->start + INC_PAGESIZE;
- }
- else {
- /* There are no free pages.. Either fragmentation is a
- * problem or we are simply out of memory. Allocation in
- * the old generation will be done through the free-list
- * this GC cycle.
- */
- aging = NULL;
- aging_htop = aging_end = NULL;
- }
- }
-
- /* Start with looking at gray objects found in earlier collection
- * stages.
- */
- VERBOSE(DEBUG_HYBRID_GC,("INCGC: Copy-Mark gray\n"));
- {
- INC_Object *obj = NULL;
-
- while (WORK_MORE && !INC_STORAGE_EMPTY(gray)) {
- Eterm *ptr;
-
- obj = INC_STORAGE_GET(gray);
- if ((*obj->this & _TAG_HEADER_MASK) == FUN_SUBTAG) {
- ptr = obj->this + thing_arityval(*obj->this) + 1;
- } else {
- ptr = obj->this;
- }
- COPYMARK(ptr,obj->this + obj->size);
- }
- /* TODO: Titta p� motsvarande i minor. */
- if (!WORK_MORE && obj != NULL)
- INC_STORE(gray,obj->this,obj->size);
- }
-
- VERBOSE(DEBUG_HYBRID_GC,("INCGC: Copy-Mark roots\n"));
- while (WORK_MORE && inc_active_proc)
- {
- /* For each process: Scan all areas containing pointers to the
- * message area. When a process is done here, all it's
- * message-pointers should be to the old generation.
- */
- Rootset rootset;
- Process *cp = inc_active_proc;
-
- ASSERT(INC_IS_ACTIVE(cp));
-
- /* MT: In a multithreaded system the process cp needs to be
- * locked here.
- */
- if (cp == p)
- rootset.n = setup_rootset(cp, objv, nobj, &rootset);
- else
- rootset.n = setup_rootset(cp, cp->arg_reg, cp->arity, &rootset);
-
- while (WORK_MORE && rootset.n--)
- {
- Eterm *ptr = rootset.v[rootset.n];
- Eterm *end = ptr + rootset.sz[rootset.n];
-
- while (WORK_MORE && ptr < end) {
- Eterm val = *ptr;
- Eterm *obj_ptr = ptr_val(val);
-
- switch (primary_tag(val)) {
- case TAG_PRIMARY_LIST:
- {
- COPYMARK_CONS(obj_ptr,aging_htop,ptr,aging_end);
- break;
- }
-
- case TAG_PRIMARY_BOXED:
- {
- COPYMARK_BOXED(obj_ptr,aging_htop,ptr,aging_end);
- break;
- }
- }
- ptr++;
- }
- }
-
-#ifdef HIPE
- /* Atomic phase */
- VERBOSE(DEBUG_HYBRID_GC,("INCGC: Native stack scan: %T\n",cp->id));
- aging_htop = ma_fullsweep_nstack(cp,aging_htop,aging_end);
-#endif
- restore_one_rootset(cp, &rootset);
-
- /* MT: cp can be unlocked now. But beware!! The message queue
- * might be updated with new pointers to the fromspace while
- * we work below. The send operation can not assume that all
- * active processes will look through their message queue
- * before deactivating as is the case in non-MT incremental
- * collection.
- */
-
- VERBOSE(DEBUG_HYBRID_GC,("INCGC: Copy-Mark process heap\n"));
- {
- Eterm *ptr = cp->scan_top;
- COPYMARK(ptr,cp->htop);
- //cp->scan_top = ptr;
- }
-
- VERBOSE(DEBUG_HYBRID_GC,("INCGC: Copy-Mark heap fragments\n"));
- {
- ErlHeapFragment* bp = MBUF(cp);
-
- while (WORK_MORE && bp) {
- Eterm *ptr = bp->mem;
- Eterm *end;
-
- if ((ARITH_HEAP(cp) >= bp->mem) &&
- (ARITH_HEAP(cp) < bp->mem + bp->size)) {
- end = ARITH_HEAP(cp);
- } else {
- end = bp->mem + bp->size;
- }
-
- COPYMARK(ptr,end);
- bp = bp->next;
- }
- }
-
- VERBOSE(DEBUG_HYBRID_GC,("INCGC: Copy-Mark gray stack\n"));
- {
- INC_Object *obj = NULL;
-
- while (WORK_MORE && !INC_STORAGE_EMPTY(gray)) {
- Eterm *ptr;
-
- obj = INC_STORAGE_GET(gray);
- if ((*obj->this & _TAG_HEADER_MASK) == FUN_SUBTAG) {
- ptr = obj->this + thing_arityval(*obj->this) + 1;
- } else {
- ptr = obj->this;
- }
- COPYMARK(ptr,obj->this + obj->size);
- }
- /* TODO: Titta p� motsvarande i minor. */
- if (!WORK_MORE && obj != NULL)
- INC_STORE(gray,obj->this,obj->size);
- }
-
- if (WORK_MORE) {
- INC_DEACTIVATE(cp);
- }
- }
-
- VERBOSE(DEBUG_HYBRID_GC,("INCGC: Copy-Mark nursery\n"));
- {
- Eterm *ptr = inc_nursery_scn_ptr;
- COPYMARK(ptr,global_htop);
- inc_nursery_scn_ptr = ptr;
- }
-
- VERBOSE(DEBUG_HYBRID_GC,("INCGC: Copy-Mark gray found in nursery\n"));
- {
- INC_Object *obj = NULL;
-
- while (WORK_MORE && !INC_STORAGE_EMPTY(gray)) {
- Eterm *ptr;
-
- obj = INC_STORAGE_GET(gray);
- if ((*obj->this & _TAG_HEADER_MASK) == FUN_SUBTAG) {
- ptr = obj->this + thing_arityval(*obj->this) + 1;
- } else {
- ptr = obj->this;
- }
- COPYMARK(ptr,obj->this + obj->size);
- }
- /* TODO: Titta p� motsvarande i minor. */
- if (!WORK_MORE && obj != NULL)
- INC_STORE(gray,obj->this,obj->size);
- }
-
-
- /**********************************************************************/
- if (WORK_MORE) {
- VERBOSE(DEBUG_HYBRID_GC,("INCGC: Sweep phase\n"));
-
- /* Atomic phase */
- VERBOSE(DEBUG_HYBRID_GC,("INCGC: Sweep externals in old generation\n"));
- {
- ExternalThing** prev = &erts_global_offheap.externals;
- ExternalThing* ptr = erts_global_offheap.externals;
-
- while (ptr) {
- Eterm* ppt = (Eterm *) ptr;
-
- if ((ptr_within(ppt, global_old_heap, global_old_hend) &&
- blackmap[ppt - global_old_heap] == 0) ||
- (ptr_within(ppt, inc_fromspc, inc_fromend) &&
- !INC_IS_FORWARDED(ppt)))
- {
- erts_deref_node_entry(ptr->node);
- *prev = ptr = ptr->next;
- } else if (ptr_within(ppt, inc_fromspc, inc_fromend)) {
- ExternalThing* ro = (ExternalThing*)INC_FORWARD_VALUE(ppt);
- *prev = ro; /* Patch to moved pos */
- prev = &ro->next;
- ptr = ro->next;
- } else {
- prev = &ptr->next;
- ptr = ptr->next;
- }
- }
- ASSERT(*prev == NULL);
- }
-
- /* Atomic phase */
- VERBOSE(DEBUG_HYBRID_GC,("INCGC: Sweep refc bins in old generation\n"));
- {
- ProcBin** prev = &erts_global_offheap.mso;
- ProcBin* ptr = erts_global_offheap.mso;
-
- while (ptr) {
- Eterm *ppt = (Eterm*)ptr;
-
- if ((ptr_within(ppt, global_old_heap, global_old_hend) &&
- blackmap[ppt - global_old_heap] == 0) ||
- (ptr_within(ppt, inc_fromspc, inc_fromend) &&
- !INC_IS_FORWARDED(ppt)))
- {
- Binary* bptr;
- *prev = ptr->next;
- bptr = ptr->val;
- if (erts_refc_dectest(&bptr->refc, 0) == 0)
- erts_bin_free(bptr);
- ptr = *prev;
- } else if (ptr_within(ppt, inc_fromspc, inc_fromend)) {
- ProcBin* ro = (ProcBin*)INC_FORWARD_VALUE(ppt);
- *prev = ro; /* Patch to moved pos */
- prev = &ro->next;
- ptr = ro->next;
- } else {
- prev = &ptr->next;
- ptr = ptr->next;
- }
- }
- ASSERT(*prev == NULL);
- }
-
- /* TODO: Currently atomic phase - Can not be later of course. */
- VERBOSE(DEBUG_HYBRID_GC,("INCGC: Sweep old generation\n"));
- {
- INC_Page *page = inc_used_mem;
- INC_Page *prev = NULL;
- inc_free_list = NULL;
-
- while (page) {
- int scavenging = 0;
- int n = page->start - global_old_heap;
- int stop = n + INC_PAGESIZE;
-
- old_gen_sz += INC_PAGESIZE;
- while (n < stop) {
- if (blackmap[n] != 0) {
- if (scavenging) {
- Eterm *ptr = global_old_heap + n;
- scavenging = 0;
- if ((ptr - free_start) * sizeof(Eterm) >=
- sizeof(INC_MemBlock))
- {
- INC_MemBlock *new = (INC_MemBlock*)free_start;
- new->size = ptr - free_start;
- new->prev = NULL;
- new->next = inc_free_list;
- if (inc_free_list)
- inc_free_list->prev = new;
- inc_free_list = new;
- }
- }
- if (blackmap[n] == 255) {
- unsigned int size =
- *(unsigned int*)(((long)&blackmap[n]+4) & ~3);
- live += size;
- n += size;
- }
- else {
- live += blackmap[n];
- n += blackmap[n];
- }
- }
- else if (!scavenging) {
- free_start = global_old_heap + n;
- scavenging = 1;
- n++;
- }
- else {
- n++;
- }
- }
-
- if (scavenging) {
- if ((global_old_heap + n - free_start) * sizeof(Eterm) >
- sizeof(INC_MemBlock))
- {
- INC_MemBlock *new = (INC_MemBlock*)free_start;
- new->size = global_old_heap + n - free_start;
- new->prev = NULL;
- new->next = inc_free_list;
- if (inc_free_list)
- inc_free_list->prev = new;
- inc_free_list = new;
- }
- else if (free_start == page->start) {
- INC_Page *next = page->next;
-
- if (prev)
- prev->next = page->next;
- else
- inc_used_mem = page->next;
-
- page->next = inc_bibop;
- inc_bibop = page;
- inc_used_pages--;
- page = next;
- continue;
- }
- }
- prev = page;
- page = page->next;
- }
- }
- }
-
- ASSERT(inc_bibop);
- /*
- This code is not expected to work right now.
- if (!inc_bibop) {
- int i;
- int new_pages = inc_pages * 2;
- int size = sizeof(Eterm) * new_pages * INC_FULLPAGE;
- Eterm *new_heap = erts_alloc(ERTS_ALC_T_MESSAGE_AREA,size);
- Eterm *new_hend = new_heap + size;
- Eterm *new_htop;
- Eterm *last_page_end;
- INC_Page *new_used_mem;
- INC_Page *page;
-
- erts_printf("The last page has been allocated..\n");
- erts_printf("We need to copy things!\n");
-
- / * Create new, bigger bag of pages * /
- for (i = 0; i < new_pages; i++)
- {
- INC_Page *this =
- (INC_Page*)(new_heap + i * INC_FULLPAGE);
- this->next = (INC_Page*)((Eterm*)this + INC_FULLPAGE);
- }
- inc_bibop = (INC_Page*)new_heap;
- ((INC_Page*)(new_heap + (new_pages - 1) *
- INC_FULLPAGE))->next = NULL;
-
- new_used_mem = inc_bibop;
- inc_bibop = inc_bibop->next;
- new_used_mem->next = NULL;
-
- / * Move stuff from old bag to new * /
- inc_free_list = NULL;
- new_htop = new_used_mem->start;
- last_page_end = new_htop + INC_PAGESIZE;
- page = inc_used_mem;
- while (page)
- {
- Eterm *ptr = page->start;
- Eterm *page_end = ptr + INC_PAGESIZE;
- int n = offsetof(INC_Page,start) / sizeof(void*) +
- ((Eterm*)page - global_old_heap);
- while (ptr < page_end)
- {
- if (blackmap[n] > 0)
- {
- if (last_page_end - new_htop < blackmap[n])
- {
- INC_Page *new_page = inc_bibop;
- inc_bibop = inc_bibop->next;
- new_page->next = new_used_mem;
- new_used_mem = new_page;
- new_htop = new_page->start;
- last_page_end = new_htop + INC_PAGESIZE;
- }
-
- memcpy(new_htop,ptr,blackmap[n] * sizeof(Eterm));
- for (i = 0; i < blackmap[n]; i++)
- {
- *ptr++ = (Eterm)new_htop++;
- }
- //new_htop += blackmap[n];
- //ptr += blackmap[n];
- / *
- if (blackmap[n] == 255) Do the right thing...
- * /
- n += blackmap[n];
- }
- else
- {
- n++; ptr++;
- }
- }
- page = page->next;
- }
-
- page = inc_used_mem;
- while (page)
- {
- Eterm *ptr = page->start;
- Eterm *page_end = ptr + INC_PAGESIZE;
-
- / * TODO: If inc_used_mem is sorted in address order, this
- * pass can be done at the same time as copying. * /
- while (ptr < page_end)
- {
- if (ptr_within(ptr_val(*ptr),global_old_heap,global_old_hend))
- {
- *ptr = *((Eterm*)ptr_val(*ptr));
- }
- ptr++;
- }
- page = page->next;
- }
-
- printf("Restore rootset after heap move. Roots: %d\r\n",roots_saved);
- while (roots_saved--)
- {
- Eterm *ptr = root_save[roots_saved];
- *ptr = *((Eterm*)ptr_val(*ptr));
- }
-
- erts_free(ERTS_ALC_T_MESSAGE_AREA,(void*)global_old_heap);
-
- global_old_heap = new_heap;
- global_old_hend = new_hend;
- inc_used_mem = new_used_mem;
- inc_pages = new_pages;
-
- if ((last_page_end - new_htop) * sizeof(Eterm) >=
- sizeof(INC_MemBlock))
- {
- inc_free_list = (INC_MemBlock*)(new_htop);
- inc_free_list->size = last_page_end - new_htop;
- inc_free_list->prev = NULL;
- inc_free_list->next = NULL;
- }
- }
- */
-
- /* I vilka l�gen kan vi vilja sl�nga p� en extra sida.. ( < 25% kvar?)
- if ()
- {
- INC_Page *new_page = inc_bibop;
- INC_MemBlock *new_free =
- (INC_MemBlock*)new_page->start;
-
- VERBOSE(DEBUG_HYBRID_GC,("INCGC: Fetching new page\n"));
- inc_bibop = inc_bibop->next;
-
- new_page->next = inc_used_mem;
- if (inc_used_mem)
- inc_used_mem->prev = new_page;
- inc_used_mem = new_page;
-
- // kolla detta med normal sidstorlek! old_gen_sz += INC_PAGESIZE;
- //BM_SWAP_TIMER(gc,misc1);
- memset(blackmap +
- ((void*)new_page - (void*)global_old_heap) / sizeof(void*),
- 0, INC_FULLPAGE);
- //BM_SWAP_TIMER(misc1,gc);
-
- new_free->prev = NULL;
- new_free->next = inc_free_list;
- new_free->size = INC_PAGESIZE;
- if (inc_free_list)
- inc_free_list->prev = new_free;
- inc_free_list = new_free;
- //printf("Snatched a new page @ 0x%08x\r\n",(int)new_page);
- //print_free_list();
- found = new_free;
- }
- */
-
- VERBOSE(DEBUG_HYBRID_GC,("INCGC: Update copy stack\n"));
- {
- Uint i;
- for (i = 0; i < ma_dst_top; i++) {
- if (ptr_within(ma_dst_stack[i],inc_fromspc,inc_fromend)) {
- if (INC_IS_FORWARDED(ma_dst_stack[i]))
- ma_dst_stack[i] = INC_FORWARD_VALUE(ma_dst_stack[i]);
- }
- }
- }
-
- if (WORK_MORE)
- {
- int size_left = INC_PAGESIZE - (aging_htop - aging->start);
-
- if (size_left > sizeof(INC_MemBlock))
- {
- ((INC_MemBlock*)aging_htop)->size = size_left;
- ((INC_MemBlock*)aging_htop)->prev = NULL;
- ((INC_MemBlock*)aging_htop)->next = inc_free_list;
- if (inc_free_list)
- inc_free_list->prev = (INC_MemBlock*)aging_htop;
- inc_free_list = (INC_MemBlock*)aging_htop;
- }
- aging->next = inc_used_mem;
- inc_used_mem = aging;
- inc_used_pages++;
-
- ma_gc_flags &= ~GC_MAJOR;
- ma_gc_flags &= ~GC_CYCLE;
-
- VERBOSE(DEBUG_HYBRID_GC,("INCGC: Major collection cycle END\n"));
- }
-
- ma_gc_flags &= ~GC_INCLUDE_ALL;
-
- BM_STOP_TIMER(old_gc);
-#ifdef BM_TIMER
- major_global_gc_time += old_gc_time;
- if (old_gc_time > max_global_major_time)
- max_global_major_time = old_gc_time;
-
- if ((old_gc_time * 1000) < MAX_PAUSE_TIME)
- pause_times_old[(int)(old_gc_time * 1000)]++;
- else
- pause_times_old[MAX_PAUSE_TIME - 1]++;
-#endif
- BM_START_TIMER(gc);
-}
-
-
-
-/***************************************************************************
- * *
- * Allocation in the old generation. Used in minor colection and when *
- * copying the rest of a message after a GC. *
- * *
- ***************************************************************************/
-
-
-Eterm *erts_inc_alloc(int need)
-{
- INC_MemBlock *this = inc_free_list;
-
- ASSERT(need < INC_PAGESIZE);
- while (this && (this->size) < need)
- {
- this = this->next;
- }
-
- if (!this)
- {
- /* If a free block large enough is not found, a new page is
- * allocated. GC_NEED_MAJOR is set so that the next garbage
- * collection cycle will be a major one, that is, both
- * generations will be garbage collected.
- */
- INC_Page *new_page = inc_bibop;
- INC_MemBlock *new_free = (INC_MemBlock*)new_page->start;
-
- if (new_page)
- {
- VERBOSE(DEBUG_HYBRID_GC,
- ("INCGC: Allocation grabs a new page\n"));
- inc_bibop = inc_bibop->next;
- new_page->next = inc_used_mem;
- inc_used_mem = new_page;
- inc_used_pages++;
-
- new_free->prev = NULL;
- new_free->next = inc_free_list;
- new_free->size = INC_PAGESIZE;
- if (inc_free_list)
- inc_free_list->prev = new_free;
- inc_free_list = new_free;
-
- this = new_free;
- if (!(ma_gc_flags & GC_MAJOR))
- ma_gc_flags |= GC_NEED_MAJOR;
- }
- else
- {
- erl_exit(-1, "inc_alloc ran out of pages!\n");
- }
- }
-
- if (((this->size) - need) * sizeof(Eterm) >= sizeof(INC_MemBlock))
- {
- INC_MemBlock *rest = (INC_MemBlock*)((Eterm*)this + need);
-
- /* The order here IS important! */
- rest->next = this->next;
-
- if (rest->next)
- rest->next->prev = rest;
-
- rest->prev = this->prev;
-
- if (rest->prev)
- rest->prev->next = rest;
- else
- inc_free_list = rest;
-
- rest->size = this->size - need;
- }
- else
- {
- if (this->prev)
- this->prev->next = this->next;
- else
- inc_free_list = this->next;
-
- if (this->next)
- this->next->prev = this->prev;
- }
-
- if (ma_gc_flags & GC_MAJOR) {
- if (need > 254) {
- blackmap[(Eterm*)this - global_old_heap] = 255;
- *(int*)((UWord)(&blackmap[(Eterm*)this - global_old_heap]+4) & ~3) =
- need;
- } else
- blackmap[(Eterm*)this - global_old_heap] = need;
- }
- return (Eterm*)this;
-}
-#endif /* INCREMENTAL */