aboutsummaryrefslogtreecommitdiffstats
path: root/erts/emulator/beam/external.c
diff options
context:
space:
mode:
Diffstat (limited to 'erts/emulator/beam/external.c')
-rw-r--r--erts/emulator/beam/external.c163
1 files changed, 116 insertions, 47 deletions
diff --git a/erts/emulator/beam/external.c b/erts/emulator/beam/external.c
index af8db4c265..0e012e9eec 100644
--- a/erts/emulator/beam/external.c
+++ b/erts/emulator/beam/external.c
@@ -1182,7 +1182,8 @@ typedef struct {
Eterm* hp_end;
int remaining_n;
char* remaining_bytes;
- Eterm* maps_head;
+ Eterm* maps_list;
+ struct dec_term_hamt_placeholder* hamt_list;
} B2TDecodeContext;
typedef struct {
@@ -1508,7 +1509,8 @@ static BIF_RETTYPE binary_to_term_int(Process* p, Uint32 flags, Eterm bin, Binar
ctx->u.dc.hp_start = HAlloc(p, ctx->heap_size);
ctx->u.dc.hp = ctx->u.dc.hp_start;
ctx->u.dc.hp_end = ctx->u.dc.hp_start + ctx->heap_size;
- ctx->u.dc.maps_head = NULL;
+ ctx->u.dc.maps_list = NULL;
+ ctx->u.dc.hamt_list = NULL;
ctx->state = B2TDecode;
/*fall through*/
case B2TDecode:
@@ -2938,9 +2940,21 @@ undo_offheap_in_area(ErlOffHeap* off_heap, Eterm* start, Eterm* end)
#endif /* DEBUG */
}
+struct dec_term_hamt_placeholder
+{
+ struct dec_term_hamt_placeholder* next;
+ Eterm* objp; /* write result here */
+ Uint size; /* nr of leafs */
+ Eterm* leaf_array;
+
+ Eterm _heap_capacity_[1];
+};
+
+#define DEC_TERM_HAMT_PLACEHOLDER_SIZE(SZ) \
+ (offsetof(struct dec_term_hamt_placeholder, _heap_capacity_) + (SZ))
/* Decode term from external format into *objp.
-** On failure return NULL and (R13B04) *hpp will be unchanged.
+** On failure return NULL and *hpp will be unchanged.
*/
static byte*
dec_term(ErtsDistExternal *edep, Eterm** hpp, byte* ep, ErlOffHeap* off_heap,
@@ -2950,7 +2964,8 @@ dec_term(ErtsDistExternal *edep, Eterm** hpp, byte* ep, ErlOffHeap* off_heap,
int n;
ErtsAtomEncoding char_enc;
register Eterm* hp; /* Please don't take the address of hp */
- Eterm *maps_head; /* for validation of maps */
+ Eterm *maps_list; /* for preprocessing of small maps */
+ struct dec_term_hamt_placeholder* hamt_list; /* for preprocessing of big maps */
Eterm* next;
SWord reds;
@@ -2960,7 +2975,8 @@ dec_term(ErtsDistExternal *edep, Eterm** hpp, byte* ep, ErlOffHeap* off_heap,
next = ctx->u.dc.next;
ep = ctx->u.dc.ep;
hpp = &ctx->u.dc.hp;
- maps_head = ctx->u.dc.maps_head;
+ maps_list = ctx->u.dc.maps_list;
+ hamt_list = ctx->u.dc.hamt_list;
if (ctx->state != B2TDecode) {
int n_limit = reds;
@@ -3041,7 +3057,8 @@ dec_term(ErtsDistExternal *edep, Eterm** hpp, byte* ep, ErlOffHeap* off_heap,
reds = ERTS_SWORD_MAX;
next = objp;
*next = (Eterm) (UWord) NULL;
- maps_head = NULL;
+ maps_list = NULL;
+ hamt_list = NULL;
}
hp = *hpp;
@@ -3577,46 +3594,68 @@ dec_term_atom_common:
break;
case MAP_EXT:
{
- map_t *mp;
Uint32 size,n;
Eterm *kptr,*vptr;
Eterm keys;
size = get_int32(ep); ep += 4;
- keys = make_tuple(hp);
- *hp++ = make_arityval(size);
- hp += size;
- kptr = hp - 1;
-
- mp = (map_t*)hp;
- hp += MAP_HEADER_SIZE;
- hp += size;
- vptr = hp - 1;
-
- /* kptr, last word for keys
- * vptr, last word for values
- */
-
- /*
- * Use thing_word to link through decoded maps.
- * The list of maps is for later validation.
- */
-
- mp->thing_word = (Eterm) COMPRESS_POINTER(maps_head);
- maps_head = (Eterm *) mp;
-
- mp->size = size;
- mp->keys = keys;
- *objp = make_map(mp);
-
- for (n = size; n; n--) {
- *vptr = (Eterm) COMPRESS_POINTER(next);
- *kptr = (Eterm) COMPRESS_POINTER(vptr);
- next = kptr;
- vptr--;
- kptr--;
- }
+ if (size <= MAP_SMALL_MAP_LIMIT) {
+ map_t *mp;
+
+ keys = make_tuple(hp);
+ *hp++ = make_arityval(size);
+ hp += size;
+ kptr = hp - 1;
+
+ mp = (map_t*)hp;
+ hp += MAP_HEADER_SIZE;
+ hp += size;
+ vptr = hp - 1;
+
+ /* kptr, last word for keys
+ * vptr, last word for values
+ */
+
+ /*
+ * Use thing_word to link through decoded maps.
+ * The list of maps is for later validation.
+ */
+
+ mp->thing_word = (Eterm) COMPRESS_POINTER(maps_list);
+ maps_list = (Eterm *) mp;
+
+ mp->size = size;
+ mp->keys = keys;
+ *objp = make_map(mp);
+
+ for (n = size; n; n--) {
+ *vptr = (Eterm) COMPRESS_POINTER(next);
+ *kptr = (Eterm) COMPRESS_POINTER(vptr);
+ next = kptr;
+ vptr--;
+ kptr--;
+ }
+ }
+ else { /* Make hamt */
+ struct dec_term_hamt_placeholder* holder =
+ (struct dec_term_hamt_placeholder*) hp;
+
+ holder->next = hamt_list;
+ hamt_list = holder;
+ holder->objp = objp;
+ holder->size = size;
+
+ hp += DEC_TERM_HAMT_PLACEHOLDER_SIZE(size);
+ holder->leaf_array = hp;
+
+ for (n = size; n; n--) {
+ CDR(hp) = (Eterm) COMPRESS_POINTER(next);
+ CAR(hp) = (Eterm) COMPRESS_POINTER(&CDR(hp));
+ next = &CAR(hp);
+ hp += 2;
+ }
+ }
}
break;
case NEW_FUN_EXT:
@@ -3837,7 +3876,7 @@ dec_term_atom_common:
ctx->u.dc.ep = ep;
ctx->u.dc.next = next;
ctx->u.dc.hp = hp;
- ctx->u.dc.maps_head = maps_head;
+ ctx->u.dc.maps_list = maps_list;
ctx->reds = 0;
return NULL;
}
@@ -3852,12 +3891,38 @@ dec_term_atom_common:
* - done here for when we know it is complete.
*/
- while (maps_head) {
- next = (Eterm *)(EXPAND_POINTER(*maps_head));
- *maps_head = MAP_HEADER;
- if (!erts_validate_and_sort_map((map_t*)maps_head))
+ while (maps_list) {
+ next = (Eterm *)(EXPAND_POINTER(*maps_list));
+ *maps_list = MAP_HEADER;
+ if (!erts_validate_and_sort_map((map_t*)maps_list))
goto error;
- maps_head = next;
+ maps_list = next;
+ }
+
+ while (hamt_list) {
+ ErtsHeapFactory factory;
+ int residue;
+
+ factory.p = NULL;
+ factory.hp = (Eterm*) hamt_list;
+ factory.hp_end = hamt_list->leaf_array;
+
+ next = (Eterm *) hamt_list->next;
+ objp = hamt_list->objp;
+
+ /*SVERK Make it reject duplicate keys */
+ *objp = erts_hashmap_from_array(&factory,
+ hamt_list->leaf_array,
+ hamt_list->size);
+ if (is_non_value(*objp))
+ goto error;
+
+ residue = factory.hp_end - factory.hp;
+ if (residue) {
+ ASSERT(residue > 0);
+ *factory.hp = make_pos_bignum_header(residue-1);
+ }
+ hamt_list = (struct dec_term_hamt_placeholder*) next;
}
if (ctx) {
@@ -4420,7 +4485,11 @@ init_done:
n = get_int32(ep);
ep += 4;
ADDTERMS(2*n);
- heap_size += 3 + n + 1 + n;
+ if (n <= MAP_SMALL_MAP_LIMIT) {
+ heap_size += 3 + n + 1 + n;
+ } else {
+ heap_size += DEC_TERM_HAMT_PLACEHOLDER_SIZE(n) + 2*n;
+ }
break;
case STRING_EXT:
CHKSIZE(2);