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authorBjörn-Egil Dahlberg <[email protected]>2016-08-01 11:00:48 +0200
committerBjörn-Egil Dahlberg <[email protected]>2016-08-01 11:00:48 +0200
commit61d70a02f3a5e51bd209c8f25df784f1e4c71cbd (patch)
tree12a918049cda86e9e1c5846bd938e26417716baa /erts/emulator/beam
parente7302e71bf2d56e2117237bb6f0df49cefc9aad2 (diff)
parente52fa24451306080be39a35444cf52210982b41a (diff)
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Merge branch 'egil/erts/dont-copy-literals/OTP-13529'
* egil/erts/dont-copy-literals/OTP-13529: erts: Refactor literal purge area arguments erts: No need to literal opt message token erts: Don't copy literals in enif_send erts: Fix literal size calculation in check_process_code erts: Remove the need for copying of literals
Diffstat (limited to 'erts/emulator/beam')
-rw-r--r--erts/emulator/beam/beam_bif_load.c6
-rw-r--r--erts/emulator/beam/copy.c84
-rw-r--r--erts/emulator/beam/erl_gc.c14
-rw-r--r--erts/emulator/beam/erl_message.c17
-rw-r--r--erts/emulator/beam/erl_nif.c7
-rw-r--r--erts/emulator/beam/erl_process.c9
-rw-r--r--erts/emulator/beam/global.h31
7 files changed, 111 insertions, 57 deletions
diff --git a/erts/emulator/beam/beam_bif_load.c b/erts/emulator/beam/beam_bif_load.c
index 92815b2bcd..37e74400bc 100644
--- a/erts/emulator/beam/beam_bif_load.c
+++ b/erts/emulator/beam/beam_bif_load.c
@@ -877,12 +877,12 @@ check_process_code(Process* rp, Module* modp, Uint flags, int *redsp, int fcalls
continue;
{
ErlHeapFragment *hf;
- Uint lit_sz;
+ Uint lit_sz = 0;
for (hf=hfrag; hf; hf = hf->next) {
if (check_mod_funs(rp, &hfrag->off_heap, mod_start, mod_size))
return am_true;
- lit_sz = hfrag_literal_size(&hf->mem[0], &hf->mem[hf->used_size],
- literals, lit_bsize);
+ lit_sz += hfrag_literal_size(&hf->mem[0], &hf->mem[hf->used_size],
+ literals, lit_bsize);
}
if (lit_sz > 0) {
ErlHeapFragment *bp = new_message_buffer(lit_sz);
diff --git a/erts/emulator/beam/copy.c b/erts/emulator/beam/copy.c
index ccc4cbad43..c4dcd6a3cc 100644
--- a/erts/emulator/beam/copy.c
+++ b/erts/emulator/beam/copy.c
@@ -40,7 +40,8 @@ static void move_one_frag(Eterm** hpp, ErlHeapFragment*, ErlOffHeap*, int);
/*
* Copy object "obj" to process p.
*/
-Eterm copy_object_x(Eterm obj, Process* to, Uint extra) {
+Eterm copy_object_x(Eterm obj, Process* to, Uint extra)
+{
if (!is_immed(obj)) {
Uint size = size_object(obj);
Eterm* hp = HAllocX(to, size, extra);
@@ -70,33 +71,46 @@ Eterm copy_object_x(Eterm obj, Process* to, Uint extra) {
* Return the "flat" size of the object.
*/
-Uint size_object(Eterm obj)
+#define in_literal_purge_area(PTR) \
+ (lit_purge_ptr && ( \
+ (lit_purge_ptr <= (PTR) && \
+ (PTR) < (lit_purge_ptr + lit_purge_sz))))
+
+Uint size_object_x(Eterm obj, erts_literal_area_t *litopt)
{
Uint sum = 0;
Eterm* ptr;
int arity;
+ Eterm *lit_purge_ptr = litopt ? litopt->lit_purge_ptr : NULL;
+ Uint lit_purge_sz = litopt ? litopt->lit_purge_sz : 0;
#ifdef DEBUG
Eterm mypid = erts_get_current_pid();
#endif
-
DECLARE_ESTACK(s);
-
VERBOSE(DEBUG_SHCOPY, ("[pid=%T] size_object %p\n", mypid, obj));
for (;;) {
switch (primary_tag(obj)) {
case TAG_PRIMARY_LIST:
- sum += 2;
ptr = list_val(obj);
+ if (litopt && erts_is_literal(obj,ptr) && !in_literal_purge_area(ptr)) {
+ goto pop_next;
+ }
+ sum += 2;
obj = *ptr++;
if (!IS_CONST(obj)) {
ESTACK_PUSH(s, obj);
- }
+ }
obj = *ptr;
break;
case TAG_PRIMARY_BOXED:
{
- Eterm hdr = *boxed_val(obj);
+ Eterm hdr;
+ ptr = boxed_val(obj);
+ if (litopt && erts_is_literal(obj,ptr) && !in_literal_purge_area(ptr)) {
+ goto pop_next;
+ }
+ hdr = *ptr;
ASSERT(is_header(hdr));
switch (hdr & _TAG_HEADER_MASK) {
case ARITYVAL_SUBTAG:
@@ -279,10 +293,6 @@ do { \
#define COUNT_OFF_HEAP (0)
-#define IN_LITERAL_PURGE_AREA(info, ptr) \
- ((info)->range_ptr && ( \
- (info)->range_ptr <= (ptr) && \
- (ptr) < ((info)->range_ptr + (info)->range_sz)))
/*
* Return the real size of an object and find sharing information
* This currently returns the same as erts_debug:size/1.
@@ -599,7 +609,7 @@ cleanup:
/*
* Copy a structure to a heap.
*/
-Eterm copy_struct_x(Eterm obj, Uint sz, Eterm** hpp, ErlOffHeap* off_heap, Uint *bsz)
+Eterm copy_struct_x(Eterm obj, Uint sz, Eterm** hpp, ErlOffHeap* off_heap, Uint *bsz, erts_literal_area_t *litopt)
{
char* hstart;
Uint hsize;
@@ -616,6 +626,8 @@ Eterm copy_struct_x(Eterm obj, Uint sz, Eterm** hpp, ErlOffHeap* off_heap, Uint
Eterm hdr;
Eterm *hend;
int i;
+ Eterm *lit_purge_ptr = litopt ? litopt->lit_purge_ptr : NULL;
+ Uint lit_purge_sz = litopt ? litopt->lit_purge_sz : 0;
#ifdef DEBUG
Eterm org_obj = obj;
Uint org_sz = sz;
@@ -651,7 +663,6 @@ Eterm copy_struct_x(Eterm obj, Uint sz, Eterm** hpp, ErlOffHeap* off_heap, Uint
L_copy:
while (hp != htop) {
obj = *hp;
-
switch (primary_tag(obj)) {
case TAG_PRIMARY_IMMED1:
hp++;
@@ -667,6 +678,10 @@ Eterm copy_struct_x(Eterm obj, Uint sz, Eterm** hpp, ErlOffHeap* off_heap, Uint
L_copy_list:
tailp = argp;
+ if (litopt && erts_is_literal(obj,objp) && !in_literal_purge_area(objp)) {
+ *tailp = obj;
+ goto L_copy;
+ }
for (;;) {
tp = tailp;
elem = CAR(objp);
@@ -674,18 +689,23 @@ Eterm copy_struct_x(Eterm obj, Uint sz, Eterm** hpp, ErlOffHeap* off_heap, Uint
hbot -= 2;
CAR(hbot) = elem;
tailp = &CDR(hbot);
- }
- else {
+ } else {
CAR(htop) = elem;
tailp = &CDR(htop);
htop += 2;
}
*tp = make_list(tailp - 1);
obj = CDR(objp);
+
if (!is_list(obj)) {
break;
}
objp = list_val(obj);
+
+ if (litopt && erts_is_literal(obj,objp) && !in_literal_purge_area(objp)) {
+ *tailp = obj;
+ goto L_copy;
+ }
}
switch (primary_tag(obj)) {
case TAG_PRIMARY_IMMED1: *tailp = obj; goto L_copy;
@@ -695,7 +715,7 @@ Eterm copy_struct_x(Eterm obj, Uint sz, Eterm** hpp, ErlOffHeap* off_heap, Uint
"%s, line %d: Internal error in copy_struct: 0x%08x\n",
__FILE__, __LINE__,obj);
}
-
+
case TAG_PRIMARY_BOXED:
if (ErtsInArea(boxed_val(obj),hstart,hsize)) {
hp++;
@@ -705,6 +725,10 @@ Eterm copy_struct_x(Eterm obj, Uint sz, Eterm** hpp, ErlOffHeap* off_heap, Uint
L_copy_boxed:
objp = boxed_val(obj);
+ if (litopt && erts_is_literal(obj,objp) && !in_literal_purge_area(objp)) {
+ *argp = obj;
+ break;
+ }
hdr = *objp;
switch (hdr & _TAG_HEADER_MASK) {
case ARITYVAL_SUBTAG:
@@ -765,7 +789,7 @@ Eterm copy_struct_x(Eterm obj, Uint sz, Eterm** hpp, ErlOffHeap* off_heap, Uint
extra_bytes = 1;
} else {
extra_bytes = 0;
- }
+ }
real_size = size+extra_bytes;
objp = binary_val(real_bin);
if (thing_subtag(*objp) == HEAP_BINARY_SUBTAG) {
@@ -780,7 +804,7 @@ Eterm copy_struct_x(Eterm obj, Uint sz, Eterm** hpp, ErlOffHeap* off_heap, Uint
} else {
ProcBin* from = (ProcBin *) objp;
ProcBin* to;
-
+
ASSERT(thing_subtag(*objp) == REFC_BINARY_SUBTAG);
if (from->flags) {
erts_emasculate_writable_binary(from);
@@ -900,6 +924,12 @@ Eterm copy_struct_x(Eterm obj, Uint sz, Eterm** hpp, ErlOffHeap* off_heap, Uint
*bsz = hend - hbot;
} else {
#ifdef DEBUG
+ if (!eq(org_obj, res)) {
+ erts_exit(ERTS_ABORT_EXIT,
+ "Internal error in copy_struct() when copying %T:"
+ " not equal to copy %T\n",
+ org_obj, res);
+ }
if (htop != hbot)
erts_exit(ERTS_ABORT_EXIT,
"Internal error in copy_struct() when copying %T:"
@@ -1036,6 +1066,8 @@ Uint copy_shared_calculate(Eterm obj, erts_shcopy_t *info)
Uint e;
unsigned sz;
Eterm* ptr;
+ Eterm *lit_purge_ptr = info->lit_purge_ptr;
+ Uint lit_purge_sz = info->lit_purge_sz;
#ifdef DEBUG
Eterm mypid = erts_get_current_pid();
#endif
@@ -1081,7 +1113,7 @@ Uint copy_shared_calculate(Eterm obj, erts_shcopy_t *info)
/* off heap list pointers are copied verbatim */
if (erts_is_literal(obj,ptr)) {
VERBOSE(DEBUG_SHCOPY, ("[pid=%T] bypassed copying %p is %T\n", mypid, ptr, obj));
- if (IN_LITERAL_PURGE_AREA(info,ptr))
+ if (in_literal_purge_area(ptr))
info->literal_size += size_object(obj);
goto pop_next;
}
@@ -1132,7 +1164,7 @@ Uint copy_shared_calculate(Eterm obj, erts_shcopy_t *info)
/* off heap pointers to boxes are copied verbatim */
if (erts_is_literal(obj,ptr)) {
VERBOSE(DEBUG_SHCOPY, ("[pid=%T] bypassed copying %p is %T\n", mypid, ptr, obj));
- if (IN_LITERAL_PURGE_AREA(info,ptr))
+ if (in_literal_purge_area(ptr))
info->literal_size += size_object(obj);
goto pop_next;
}
@@ -1298,6 +1330,8 @@ Uint copy_shared_perform(Eterm obj, Uint size, erts_shcopy_t *info,
Eterm* resp;
Eterm *hbot, *hend;
unsigned remaining;
+ Eterm *lit_purge_ptr = info->lit_purge_ptr;
+ Uint lit_purge_sz = info->lit_purge_sz;
#ifdef DEBUG
Eterm mypid = erts_get_current_pid();
Eterm saved_obj = obj;
@@ -1347,11 +1381,11 @@ Uint copy_shared_perform(Eterm obj, Uint size, erts_shcopy_t *info,
ptr = list_val(obj);
/* off heap list pointers are copied verbatim */
if (erts_is_literal(obj,ptr)) {
- if (!IN_LITERAL_PURGE_AREA(info,ptr)) {
+ if (!in_literal_purge_area(ptr)) {
*resp = obj;
} else {
Uint bsz = 0;
- *resp = copy_struct_x(obj, hbot - hp, &hp, off_heap, &bsz);
+ *resp = copy_struct_x(obj, hbot - hp, &hp, off_heap, &bsz, NULL); /* copy literal */
hbot -= bsz;
}
goto cleanup_next;
@@ -1415,11 +1449,11 @@ Uint copy_shared_perform(Eterm obj, Uint size, erts_shcopy_t *info,
ptr = boxed_val(obj);
/* off heap pointers to boxes are copied verbatim */
if (erts_is_literal(obj,ptr)) {
- if (!IN_LITERAL_PURGE_AREA(info,ptr)) {
+ if (!in_literal_purge_area(ptr)) {
*resp = obj;
} else {
Uint bsz = 0;
- *resp = copy_struct_x(obj, hbot - hp, &hp, off_heap, &bsz);
+ *resp = copy_struct_x(obj, hbot - hp, &hp, off_heap, &bsz, NULL); /* copy literal */
hbot -= bsz;
}
goto cleanup_next;
@@ -1923,7 +1957,7 @@ move_one_frag(Eterm** hpp, ErlHeapFragment* frag, ErlOffHeap* off_heap, int lite
if (is_header(val)) {
struct erl_off_heap_header* hdr = (struct erl_off_heap_header*)hp;
ASSERT(ptr + header_arity(val) < end);
- MOVE_BOXED(ptr, val, hp, &dummy_ref);
+ MOVE_BOXED(ptr, val, hp, &dummy_ref);
switch (val & _HEADER_SUBTAG_MASK) {
case REFC_BINARY_SUBTAG:
case FUN_SUBTAG:
diff --git a/erts/emulator/beam/erl_gc.c b/erts/emulator/beam/erl_gc.c
index 8b0dd9a5a6..ef18a508a5 100644
--- a/erts/emulator/beam/erl_gc.c
+++ b/erts/emulator/beam/erl_gc.c
@@ -2157,26 +2157,18 @@ copy_one_frag(Eterm** hpp, ErlOffHeap* off_heap,
*hp++ = val;
break;
case TAG_PRIMARY_LIST:
-#ifdef SHCOPY_SEND
if (erts_is_literal(val,list_val(val))) {
*hp++ = val;
} else {
*hp++ = offset_ptr(val, offs);
}
-#else
- *hp++ = offset_ptr(val, offs);
-#endif
break;
case TAG_PRIMARY_BOXED:
-#ifdef SHCOPY_SEND
if (erts_is_literal(val,boxed_val(val))) {
*hp++ = val;
} else {
*hp++ = offset_ptr(val, offs);
}
-#else
- *hp++ = offset_ptr(val, offs);
-#endif
break;
case TAG_PRIMARY_HEADER:
*hp++ = val;
@@ -2262,10 +2254,12 @@ move_msgq_to_heap(Process *p)
ASSERT(mp->data.dist_ext->heap_size >= 0);
if (is_not_nil(ERL_MESSAGE_TOKEN(mp))) {
bp = erts_dist_ext_trailer(mp->data.dist_ext);
+ /* Tokens does not use literal optimization */
ERL_MESSAGE_TOKEN(mp) = copy_struct(ERL_MESSAGE_TOKEN(mp),
bp->used_size,
- &factory.hp,
- factory.off_heap);
+ &factory.hp,
+ factory.off_heap);
+
erts_cleanup_offheap(&bp->off_heap);
}
ERL_MESSAGE_TERM(mp) = erts_decode_dist_ext(&factory,
diff --git a/erts/emulator/beam/erl_message.c b/erts/emulator/beam/erl_message.c
index 91e06cde2d..e9f0586edd 100644
--- a/erts/emulator/beam/erl_message.c
+++ b/erts/emulator/beam/erl_message.c
@@ -696,6 +696,9 @@ erts_send_message(Process* sender,
erts_aint32_t receiver_state;
#ifdef SHCOPY_SEND
erts_shcopy_t info;
+#else
+ erts_literal_area_t litarea;
+ INITIALIZE_LITERAL_PURGE_AREA(litarea);
#endif
#ifdef USE_VM_PROBES
@@ -725,7 +728,7 @@ erts_send_message(Process* sender,
*/
if (have_seqtrace(stoken)) {
seq_trace_update_send(sender);
- seq_trace_output(stoken, message, SEQ_TRACE_SEND,
+ seq_trace_output(stoken, message, SEQ_TRACE_SEND,
receiver->common.id, sender);
seq_trace_size = 6; /* TUPLE5 */
}
@@ -741,7 +744,7 @@ erts_send_message(Process* sender,
INITIALIZE_SHCOPY(info);
msize = copy_shared_calculate(message, &info);
#else
- msize = size_object(message);
+ msize = size_object_litopt(message, &litarea);
#endif
mp = erts_alloc_message_heap_state(receiver,
&receiver_state,
@@ -760,7 +763,7 @@ erts_send_message(Process* sender,
DESTROY_SHCOPY(info);
#else
if (is_not_immed(message))
- message = copy_struct(message, msize, &hp, ohp);
+ message = copy_struct_litopt(message, msize, &hp, ohp, &litarea);
#endif
if (is_immed(stoken))
token = stoken;
@@ -796,7 +799,7 @@ erts_send_message(Process* sender,
INITIALIZE_SHCOPY(info);
msize = copy_shared_calculate(message, &info);
#else
- msize = size_object(message);
+ msize = size_object_litopt(message, &litarea);
#endif
mp = erts_alloc_message_heap_state(receiver,
&receiver_state,
@@ -810,7 +813,7 @@ erts_send_message(Process* sender,
DESTROY_SHCOPY(info);
#else
if (is_not_immed(message))
- message = copy_struct(message, msize, &hp, ohp);
+ message = copy_struct_litopt(message, msize, &hp, ohp, &litarea);
#endif
}
#ifdef USE_VM_PROBES
@@ -998,8 +1001,8 @@ erts_move_messages_off_heap(Process *c_p)
hp = hfrag->mem;
if (is_not_immed(ERL_MESSAGE_TERM(mp)))
ERL_MESSAGE_TERM(mp) = copy_struct(ERL_MESSAGE_TERM(mp),
- msg_sz, &hp,
- &hfrag->off_heap);
+ msg_sz, &hp,
+ &hfrag->off_heap);
if (is_not_immed(ERL_MESSAGE_TOKEN(mp)))
ERL_MESSAGE_TOKEN(mp) = copy_struct(ERL_MESSAGE_TOKEN(mp),
token_sz, &hp,
diff --git a/erts/emulator/beam/erl_nif.c b/erts/emulator/beam/erl_nif.c
index c6127a4967..6bd27d11f4 100644
--- a/erts/emulator/beam/erl_nif.c
+++ b/erts/emulator/beam/erl_nif.c
@@ -627,9 +627,12 @@ int enif_send(ErlNifEnv* env, const ErlNifPid* to_pid,
MBUF(&menv->phony_proc) = NULL;
}
} else {
- Uint sz = size_object(msg);
+ erts_literal_area_t litarea;
ErlOffHeap *ohp;
Eterm *hp;
+ Uint sz;
+ INITIALIZE_LITERAL_PURGE_AREA(litarea);
+ sz = size_object_litopt(msg, &litarea);
if (env && !env->tracee) {
flush_env(env);
mp = erts_alloc_message_heap(rp, &rp_locks, sz, &hp, &ohp);
@@ -649,7 +652,7 @@ int enif_send(ErlNifEnv* env, const ErlNifPid* to_pid,
ohp = &bp->off_heap;
}
}
- msg = copy_struct(msg, sz, &hp, ohp);
+ msg = copy_struct_litopt(msg, sz, &hp, ohp, &litarea);
}
ERL_MESSAGE_TERM(mp) = msg;
diff --git a/erts/emulator/beam/erl_process.c b/erts/emulator/beam/erl_process.c
index b5d8c5bc75..85c37e08be 100644
--- a/erts/emulator/beam/erl_process.c
+++ b/erts/emulator/beam/erl_process.c
@@ -11099,6 +11099,9 @@ erl_create_process(Process* parent, /* Parent of process (default group leader).
#ifdef SHCOPY_SPAWN
erts_shcopy_t info;
INITIALIZE_SHCOPY(info);
+#else
+ erts_literal_area_t litarea;
+ INITIALIZE_LITERAL_PURGE_AREA(litarea);
#endif
erts_smp_proc_lock(parent, ERTS_PROC_LOCKS_ALL_MINOR);
@@ -11157,7 +11160,7 @@ erl_create_process(Process* parent, /* Parent of process (default group leader).
#ifdef SHCOPY_SPAWN
arg_size = copy_shared_calculate(args, &info);
#else
- arg_size = size_object(args);
+ arg_size = size_object_litopt(args, &litarea);
#endif
heap_need = arg_size;
@@ -11181,7 +11184,7 @@ erl_create_process(Process* parent, /* Parent of process (default group leader).
}
p->schedule_count = 0;
ASSERT(p->min_heap_size == erts_next_heap_size(p->min_heap_size, 0));
-
+
p->u.initial[INITIAL_MOD] = mod;
p->u.initial[INITIAL_FUN] = func;
p->u.initial[INITIAL_ARI] = (Uint) arity;
@@ -11239,7 +11242,7 @@ erl_create_process(Process* parent, /* Parent of process (default group leader).
p->arg_reg[2] = copy_shared_perform(args, arg_size, &info, &p->htop, &p->off_heap);
DESTROY_SHCOPY(info);
#else
- p->arg_reg[2] = copy_struct(args, arg_size, &p->htop, &p->off_heap);
+ p->arg_reg[2] = copy_struct_litopt(args, arg_size, &p->htop, &p->off_heap, &litarea);
#endif
p->arity = 3;
diff --git a/erts/emulator/beam/global.h b/erts/emulator/beam/global.h
index bf2e50e52f..1423973739 100644
--- a/erts/emulator/beam/global.h
+++ b/erts/emulator/beam/global.h
@@ -1085,8 +1085,8 @@ typedef struct {
Eterm* shtable_start;
ErtsAlcType_t shtable_alloc_type;
Uint literal_size;
- Eterm *range_ptr;
- Uint range_sz;
+ Eterm *lit_purge_ptr;
+ Uint lit_purge_sz;
} erts_shcopy_t;
#define INITIALIZE_SHCOPY(info) \
@@ -1095,8 +1095,8 @@ do { \
info.bitstore_start = info.bitstore_default; \
info.shtable_start = info.shtable_default; \
info.literal_size = 0; \
- info.range_ptr = erts_clrange.ptr; \
- info.range_sz = erts_clrange.sz; \
+ info.lit_purge_ptr = erts_clrange.ptr; \
+ info.lit_purge_sz = erts_clrange.sz; \
} while(0)
#define DESTROY_SHCOPY(info) \
@@ -1113,18 +1113,35 @@ do { \
} while(0)
/* copy.c */
+typedef struct {
+ Eterm *lit_purge_ptr;
+ Uint lit_purge_sz;
+} erts_literal_area_t;
+
+#define INITIALIZE_LITERAL_PURGE_AREA(Area) \
+ do { \
+ (Area).lit_purge_ptr = erts_clrange.ptr; \
+ (Area).lit_purge_sz = erts_clrange.sz; \
+ } while(0)
+
Eterm copy_object_x(Eterm, Process*, Uint);
#define copy_object(Term, Proc) copy_object_x(Term,Proc,0)
-Uint size_object(Eterm);
+Uint size_object_x(Eterm, erts_literal_area_t*);
+#define size_object(Term) size_object_x(Term,NULL)
+#define size_object_litopt(Term,LitArea) size_object_x(Term,LitArea)
+
Uint copy_shared_calculate(Eterm, erts_shcopy_t*);
Eterm copy_shared_perform(Eterm, Uint, erts_shcopy_t*, Eterm**, ErlOffHeap*);
Uint size_shared(Eterm);
-Eterm copy_struct_x(Eterm, Uint, Eterm**, ErlOffHeap*, Uint* bsz);
+Eterm copy_struct_x(Eterm, Uint, Eterm**, ErlOffHeap*, Uint*, erts_literal_area_t*);
#define copy_struct(Obj,Sz,HPP,OH) \
- copy_struct_x(Obj,Sz,HPP,OH,NULL)
+ copy_struct_x(Obj,Sz,HPP,OH,NULL,NULL)
+#define copy_struct_litopt(Obj,Sz,HPP,OH,LitArea) \
+ copy_struct_x(Obj,Sz,HPP,OH,NULL,LitArea)
+
Eterm copy_shallow(Eterm*, Uint, Eterm**, ErlOffHeap*);
void erts_move_multi_frags(Eterm** hpp, ErlOffHeap*, ErlHeapFragment* first,