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-rw-r--r--erts/emulator/beam/utils.c938
1 files changed, 837 insertions, 101 deletions
diff --git a/erts/emulator/beam/utils.c b/erts/emulator/beam/utils.c
index b8f58754b3..3549e18538 100644
--- a/erts/emulator/beam/utils.c
+++ b/erts/emulator/beam/utils.c
@@ -190,12 +190,18 @@ erts_set_hole_marker(Eterm* ptr, Uint sz)
* Helper function for the ESTACK macros defined in global.h.
*/
void
-erl_grow_estack(ErtsEStack* s, Eterm* default_estack)
+erl_grow_estack(ErtsEStack* s, Uint need)
{
Uint old_size = (s->end - s->start);
- Uint new_size = old_size * 2;
+ Uint new_size;
Uint sp_offs = s->sp - s->start;
- if (s->start != default_estack) {
+
+ if (need < old_size)
+ new_size = 2*old_size;
+ else
+ new_size = ((need / old_size) + 2) * old_size;
+
+ if (s->start != s->edefault) {
s->start = erts_realloc(s->alloc_type, s->start,
new_size*sizeof(Eterm));
} else {
@@ -210,12 +216,18 @@ erl_grow_estack(ErtsEStack* s, Eterm* default_estack)
* Helper function for the WSTACK macros defined in global.h.
*/
void
-erl_grow_wstack(ErtsWStack* s, UWord* default_wstack)
+erl_grow_wstack(ErtsWStack* s, Uint need)
{
Uint old_size = (s->wend - s->wstart);
- Uint new_size = old_size * 2;
+ Uint new_size;
Uint sp_offs = s->wsp - s->wstart;
- if (s->wstart != default_wstack) {
+
+ if (need < old_size)
+ new_size = 2 * old_size;
+ else
+ new_size = ((need / old_size) + 2) * old_size;
+
+ if (s->wstart != s->wdefault) {
s->wstart = erts_realloc(s->alloc_type, s->wstart,
new_size*sizeof(UWord));
} else {
@@ -227,6 +239,32 @@ erl_grow_wstack(ErtsWStack* s, UWord* default_wstack)
s->wsp = s->wstart + sp_offs;
}
+/*
+ * Helper function for the PSTACK macros defined in global.h.
+ */
+void
+erl_grow_pstack(ErtsPStack* s, void* default_pstack, unsigned need_bytes)
+{
+ Uint old_size = s->pend - s->pstart;
+ Uint new_size;
+ Uint sp_offs = s->psp - s->pstart;
+
+ if (need_bytes < old_size)
+ new_size = 2 * old_size;
+ else
+ new_size = ((need_bytes / old_size) + 2) * old_size;
+
+ if (s->pstart != default_pstack) {
+ s->pstart = erts_realloc(s->alloc_type, s->pstart, new_size);
+ } else {
+ byte* new_ptr = erts_alloc(s->alloc_type, new_size);
+ sys_memcpy(new_ptr, s->pstart, old_size);
+ s->pstart = new_ptr;
+ }
+ s->pend = s->pstart + new_size;
+ s->psp = s->pstart + sp_offs;
+}
+
/* CTYPE macros */
#define LATIN1
@@ -314,6 +352,17 @@ int erts_fit_in_bits_int32(Sint32 value)
return fit_in_bits((Sint64) (Uint32) value, 4);
}
+int erts_fit_in_bits_uint(Uint value)
+{
+#if ERTS_SIZEOF_ETERM == 4
+ return fit_in_bits((Sint64) (Uint32) value, 4);
+#elif ERTS_SIZEOF_ETERM == 8
+ return fit_in_bits(value, 5);
+#else
+# error "No way, Jose"
+#endif
+}
+
int
erts_print(int to, void *arg, char *format, ...)
{
@@ -792,10 +841,10 @@ Uint32 make_hash(Eterm term_arg)
unsigned op;
/* Must not collide with the real tag_val_def's: */
-#define MAKE_HASH_TUPLE_OP 0x11
-#define MAKE_HASH_TERM_ARRAY_OP 0x12
-#define MAKE_HASH_CDR_PRE_OP 0x13
-#define MAKE_HASH_CDR_POST_OP 0x14
+#define MAKE_HASH_TUPLE_OP (FIRST_VACANT_TAG_DEF)
+#define MAKE_HASH_TERM_ARRAY_OP (FIRST_VACANT_TAG_DEF+1)
+#define MAKE_HASH_CDR_PRE_OP (FIRST_VACANT_TAG_DEF+2)
+#define MAKE_HASH_CDR_POST_OP (FIRST_VACANT_TAG_DEF+3)
/*
** Convenience macro for calculating a bytewise hash on an unsigned 32 bit
@@ -975,21 +1024,9 @@ tail_recur:
break;
}
case MAP_DEF:
+ case HASHMAP_DEF:
{
- map_t *mp = (map_t *)map_val(term);
- int size = map_get_size(mp);
- Eterm *ks = map_get_keys(mp);
- Eterm *vs = map_get_values(mp);
-
- /* Use a prime with size to remedy some of
- * the {} and <<>> hash problems */
- hash = hash*FUNNY_NUMBER13 + FUNNY_NUMBER14 + size;
- if (size == 0)
- break;
-
- /* push values first */
- WSTACK_PUSH3(stack, (UWord)vs, (UWord) size, MAKE_HASH_TERM_ARRAY_OP);
- WSTACK_PUSH3(stack, (UWord)ks, (UWord) size, MAKE_HASH_TERM_ARRAY_OP);
+ hash = hash*FUNNY_NUMBER13 + FUNNY_NUMBER14 + make_hash2(term);
break;
}
case TUPLE_DEF:
@@ -1095,10 +1132,11 @@ Uint32
make_hash2(Eterm term)
{
Uint32 hash;
- Uint32 hash_xor_keys = 0;
- Uint32 hash_xor_values = 0;
+ Uint32 hash_xor_pairs;
DeclareTmpHeapNoproc(tmp_big,2);
+ ERTS_UNDEF(hash_xor_pairs, 0);
+
/* (HCONST * {2, ..., 16}) mod 2^32 */
#define HCONST_2 0x3c6ef372UL
#define HCONST_3 0xdaa66d2bUL
@@ -1115,10 +1153,15 @@ make_hash2(Eterm term)
#define HCONST_14 0xa708a81eUL
#define HCONST_15 0x454021d7UL
#define HCONST_16 0xe3779b90UL
+#define HCONST_17 0x81af1549UL
+#define HCONST_18 0x1fe68f02UL
+#define HCONST_19 0xbe1e08bbUL
+#define HCONST_20 0x5c558274UL
+#define HCONST_21 0xfa8cfc2dUL
#define HASH_MAP_TAIL (_make_header(1,_TAG_HEADER_REF))
-#define HASH_MAP_KEY (_make_header(2,_TAG_HEADER_REF))
-#define HASH_MAP_VAL (_make_header(3,_TAG_HEADER_REF))
+#define HASH_MAP_PAIR (_make_header(2,_TAG_HEADER_REF))
+#define HASH_CDR (_make_header(3,_TAG_HEADER_REF))
#define UINT32_HASH_2(Expr1, Expr2, AConst) \
do { \
@@ -1141,6 +1184,13 @@ make_hash2(Eterm term)
} while(0)
#define IS_SSMALL28(x) (((Uint) (((x) >> (28-1)) + 1)) < 2)
+
+#ifdef ARCH_64
+# define POINTER_HASH(Ptr, AConst) UINT32_HASH_2((Uint32)(UWord)(Ptr), (((UWord)(Ptr)) >> 32), AConst)
+#else
+# define POINTER_HASH(Ptr, AConst) UINT32_HASH(Ptr, AConst)
+#endif
+
/* Optimization. Simple cases before declaration of estack. */
if (primary_tag(term) == TAG_PRIMARY_IMMED1) {
switch (term & _TAG_IMMED1_MASK) {
@@ -1195,9 +1245,9 @@ make_hash2(Eterm term)
if (c > 0)
UINT32_HASH(sh, HCONST_4);
if (is_list(term)) {
- term = *ptr;
- tmp = *++ptr;
- ESTACK_PUSH(s, tmp);
+ tmp = CDR(ptr);
+ ESTACK_PUSH(s, tmp);
+ term = CAR(ptr);
}
}
break;
@@ -1214,46 +1264,92 @@ make_hash2(Eterm term)
UINT32_HASH(arity, HCONST_9);
if (arity == 0) /* Empty tuple */
goto hash2_common;
- for (i = arity; i >= 1; i--) {
- tmp = elem[i];
- ESTACK_PUSH(s, tmp);
+ for (i = arity; ; i--) {
+ term = elem[i];
+ if (i == 1)
+ break;
+ ESTACK_PUSH(s, term);
}
- goto hash2_common;
}
break;
case MAP_SUBTAG:
{
- map_t *mp = (map_t *)map_val(term);
+ flatmap_t *mp = (flatmap_t *)flatmap_val(term);
int i;
- int size = map_get_size(mp);
- Eterm *ks = map_get_keys(mp);
- Eterm *vs = map_get_values(mp);
+ int size = flatmap_get_size(mp);
+ Eterm *ks = flatmap_get_keys(mp);
+ Eterm *vs = flatmap_get_values(mp);
UINT32_HASH(size, HCONST_16);
if (size == 0) {
goto hash2_common;
}
- ESTACK_PUSH4(s, hash_xor_values, hash_xor_keys, hash, HASH_MAP_TAIL);
- hash = 0;
- hash_xor_keys = 0;
- hash_xor_values = 0;
- for (i = size - 1; i >= 0; i--) {
- tmp = vs[i];
- ESTACK_PUSH2(s, HASH_MAP_VAL, tmp);
- }
- /* We do not want to expose the tuple representation.
- * Do not push the keys as a tuple.
+ /* We want a portable hash function that is *independent* of
+ * the order in which keys and values are encountered.
+ * We therefore calculate context independent hashes for all .
+ * key-value pairs and then xor them together.
*/
+ ESTACK_PUSH(s, hash_xor_pairs);
+ ESTACK_PUSH(s, hash);
+ ESTACK_PUSH(s, HASH_MAP_TAIL);
+ hash = 0;
+ hash_xor_pairs = 0;
for (i = size - 1; i >= 0; i--) {
- tmp = ks[i];
- ESTACK_PUSH2(s, HASH_MAP_KEY, tmp);
+ ESTACK_PUSH(s, HASH_MAP_PAIR);
+ ESTACK_PUSH(s, vs[i]);
+ ESTACK_PUSH(s, ks[i]);
}
goto hash2_common;
}
break;
+ case HASHMAP_SUBTAG:
+ {
+ Eterm* ptr = boxed_val(term) + 1;
+ Uint size;
+ int i;
+ switch (hdr & _HEADER_MAP_SUBTAG_MASK) {
+ case HAMT_SUBTAG_HEAD_ARRAY:
+ case HAMT_SUBTAG_HEAD_BITMAP:
+ size = *ptr++;
+ UINT32_HASH(size, HCONST_16);
+ if (size == 0)
+ goto hash2_common;
+ ESTACK_PUSH(s, hash_xor_pairs);
+ ESTACK_PUSH(s, hash);
+ ESTACK_PUSH(s, HASH_MAP_TAIL);
+ hash = 0;
+ hash_xor_pairs = 0;
+ }
+ switch (hdr & _HEADER_MAP_SUBTAG_MASK) {
+ case HAMT_SUBTAG_HEAD_ARRAY:
+ case HAMT_SUBTAG_NODE_ARRAY:
+ i = 16;
+ break;
+ case HAMT_SUBTAG_HEAD_BITMAP:
+ case HAMT_SUBTAG_NODE_BITMAP:
+ i = hashmap_bitcount(MAP_HEADER_VAL(hdr));
+ break;
+ default:
+ erl_exit(1, "bad header");
+ }
+ while (i) {
+ if (is_list(*ptr)) {
+ Eterm* cons = list_val(*ptr);
+ ESTACK_PUSH(s, HASH_MAP_PAIR);
+ ESTACK_PUSH(s, CDR(cons));
+ ESTACK_PUSH(s, CAR(cons));
+ }
+ else {
+ ASSERT(is_boxed(*ptr));
+ ESTACK_PUSH(s, *ptr);
+ }
+ i--; ptr++;
+ }
+ goto hash2_common;
+ }
+ break;
case EXPORT_SUBTAG:
{
Export* ep = *((Export **) (export_val(term) + 1));
-
UINT32_HASH_2
(ep->code[2],
atom_tab(atom_val(ep->code[0]))->slot.bucket.hvalue,
@@ -1268,7 +1364,6 @@ make_hash2(Eterm term)
{
ErlFunThing* funp = (ErlFunThing *) fun_val(term);
Uint num_free = funp->num_free;
-
UINT32_HASH_2
(num_free,
atom_tab(atom_val(funp->fe->module))->slot.bucket.hvalue,
@@ -1349,7 +1444,8 @@ make_hash2(Eterm term)
do {
Uint t;
Uint32 x, y;
- t = i < n ? BIG_DIGIT(ptr, i++) : 0;
+ ASSERT(i < n);
+ t = BIG_DIGIT(ptr, i++);
x = t & 0xffffffff;
y = t >> 32;
UINT32_HASH_2(x, y, con);
@@ -1457,20 +1553,397 @@ make_hash2(Eterm term)
switch (term) {
case HASH_MAP_TAIL: {
hash = (Uint32) ESTACK_POP(s);
- UINT32_HASH(hash_xor_keys, HCONST_16);
- UINT32_HASH(hash_xor_values, HCONST_16);
- hash_xor_keys = (Uint32) ESTACK_POP(s);
- hash_xor_values = (Uint32) ESTACK_POP(s);
+ UINT32_HASH(hash_xor_pairs, HCONST_19);
+ hash_xor_pairs = (Uint32) ESTACK_POP(s);
goto hash2_common;
}
- case HASH_MAP_KEY:
- hash_xor_keys ^= hash;
+ case HASH_MAP_PAIR:
+ hash_xor_pairs ^= hash;
hash = 0;
goto hash2_common;
- case HASH_MAP_VAL:
- hash_xor_values ^= hash;
+ default:
+ break;
+ }
+ }
+ }
+ }
+}
+
+/* Term hash function for internal use.
+ *
+ * Limitation #1: Is not "portable" in any way between different VM instances.
+ *
+ * Limitation #2: The hash value is only valid as long as the term exists
+ * somewhere in the VM. Why? Because external pids, ports and refs are hashed
+ * by mixing the node *pointer* value. If a node disappears and later reappears
+ * with a new ErlNode struct, externals from that node will hash different than
+ * before.
+ *
+ * One IMPORTANT property must hold (for hamt).
+ * EVERY BIT of the term that is significant for equality (see EQ)
+ * MUST BE USED AS INPUT FOR THE HASH. Two different terms must always have a
+ * chance of hashing different when salted: hash([Salt|A]) vs hash([Salt|B]).
+ *
+ * This is why we can not use cached hash values for atoms for example.
+ *
+ */
+
+#define CONST_HASH(AConst) \
+do { /* Lightweight mixing of constant (type info) */ \
+ hash ^= AConst; \
+ hash = (hash << 17) ^ (hash >> (32-17)); \
+} while (0)
+
+Uint32
+make_internal_hash(Eterm term)
+{
+ Uint32 hash;
+ Uint32 hash_xor_pairs;
+
+ ERTS_UNDEF(hash_xor_pairs, 0);
+
+ /* Optimization. Simple cases before declaration of estack. */
+ if (primary_tag(term) == TAG_PRIMARY_IMMED1) {
+ hash = 0;
+ #if ERTS_SIZEOF_ETERM == 8
+ UINT32_HASH_2((Uint32)term, (Uint32)(term >> 32), HCONST);
+ #elif ERTS_SIZEOF_ETERM == 4
+ UINT32_HASH(term, HCONST);
+ #else
+ # error "No you don't"
+ #endif
+ return hash;
+ }
+ {
+ Eterm tmp;
+ DECLARE_ESTACK(s);
+
+ UseTmpHeapNoproc(2);
+ hash = 0;
+ for (;;) {
+ switch (primary_tag(term)) {
+ case TAG_PRIMARY_LIST:
+ {
+ int c = 0;
+ Uint32 sh = 0;
+ Eterm* ptr = list_val(term);
+ while (is_byte(*ptr)) {
+ /* Optimization for strings. */
+ sh = (sh << 8) + unsigned_val(*ptr);
+ if (c == 3) {
+ UINT32_HASH(sh, HCONST_4);
+ c = sh = 0;
+ } else {
+ c++;
+ }
+ term = CDR(ptr);
+ if (is_not_list(term))
+ break;
+ ptr = list_val(term);
+ }
+ if (c > 0)
+ UINT32_HASH(sh, HCONST_4);
+ if (is_list(term)) {
+ tmp = CDR(ptr);
+ CONST_HASH(HCONST_17); /* Hash CAR in cons cell */
+ ESTACK_PUSH(s, tmp);
+ if (is_not_list(tmp)) {
+ ESTACK_PUSH(s, HASH_CDR);
+ }
+ term = CAR(ptr);
+ }
+ }
+ break;
+ case TAG_PRIMARY_BOXED:
+ {
+ Eterm hdr = *boxed_val(term);
+ ASSERT(is_header(hdr));
+ switch (hdr & _TAG_HEADER_MASK) {
+ case ARITYVAL_SUBTAG:
+ {
+ int i;
+ int arity = header_arity(hdr);
+ Eterm* elem = tuple_val(term);
+ UINT32_HASH(arity, HCONST_9);
+ if (arity == 0) /* Empty tuple */
+ goto pop_next;
+ for (i = arity; ; i--) {
+ term = elem[i];
+ if (i == 1)
+ break;
+ ESTACK_PUSH(s, term);
+ }
+ }
+ break;
+ case MAP_SUBTAG:
+ {
+ flatmap_t *mp = (flatmap_t *)flatmap_val(term);
+ int i;
+ int size = flatmap_get_size(mp);
+ Eterm *ks = flatmap_get_keys(mp);
+ Eterm *vs = flatmap_get_values(mp);
+ UINT32_HASH(size, HCONST_16);
+ if (size == 0) {
+ goto pop_next;
+ }
+ /* We want a hash function that is *independent* of
+ * the order in which keys and values are encountered.
+ * We therefore calculate context independent hashes for all .
+ * key-value pairs and then xor them together.
+ */
+ ESTACK_PUSH(s, hash_xor_pairs);
+ ESTACK_PUSH(s, hash);
+ ESTACK_PUSH(s, HASH_MAP_TAIL);
+ hash = 0;
+ hash_xor_pairs = 0;
+ for (i = size - 1; i >= 0; i--) {
+ ESTACK_PUSH(s, HASH_MAP_PAIR);
+ ESTACK_PUSH(s, vs[i]);
+ ESTACK_PUSH(s, ks[i]);
+ }
+ goto pop_next;
+ }
+ break;
+ case HASHMAP_SUBTAG:
+ {
+ Eterm* ptr = boxed_val(term) + 1;
+ Uint size;
+ int i;
+ switch (hdr & _HEADER_MAP_SUBTAG_MASK) {
+ case HAMT_SUBTAG_HEAD_ARRAY:
+ case HAMT_SUBTAG_HEAD_BITMAP:
+ size = *ptr++;
+ UINT32_HASH(size, HCONST_16);
+ if (size == 0)
+ goto pop_next;
+ ESTACK_PUSH(s, hash_xor_pairs);
+ ESTACK_PUSH(s, hash);
+ ESTACK_PUSH(s, HASH_MAP_TAIL);
+ hash = 0;
+ hash_xor_pairs = 0;
+ }
+ switch (hdr & _HEADER_MAP_SUBTAG_MASK) {
+ case HAMT_SUBTAG_HEAD_ARRAY:
+ case HAMT_SUBTAG_NODE_ARRAY:
+ i = 16;
+ break;
+ case HAMT_SUBTAG_HEAD_BITMAP:
+ case HAMT_SUBTAG_NODE_BITMAP:
+ i = hashmap_bitcount(MAP_HEADER_VAL(hdr));
+ break;
+ default:
+ erl_exit(1, "bad header");
+ }
+ while (i) {
+ if (is_list(*ptr)) {
+ Eterm* cons = list_val(*ptr);
+ ESTACK_PUSH(s, HASH_MAP_PAIR);
+ ESTACK_PUSH(s, CDR(cons));
+ ESTACK_PUSH(s, CAR(cons));
+ }
+ else {
+ ASSERT(is_boxed(*ptr));
+ ESTACK_PUSH(s, *ptr);
+ }
+ i--; ptr++;
+ }
+ goto pop_next;
+ }
+ break;
+ case EXPORT_SUBTAG:
+ {
+ Export* ep = *((Export **) (export_val(term) + 1));
+ /* Assumes Export entries never moves */
+ POINTER_HASH(ep, HCONST_14);
+ goto pop_next;
+ }
+
+ case FUN_SUBTAG:
+ {
+ ErlFunThing* funp = (ErlFunThing *) fun_val(term);
+ Uint num_free = funp->num_free;
+ UINT32_HASH_2(num_free, funp->fe->module, HCONST_20);
+ UINT32_HASH_2(funp->fe->old_index, funp->fe->old_uniq, HCONST_21);
+ if (num_free == 0) {
+ goto pop_next;
+ } else {
+ Eterm* bptr = funp->env + num_free - 1;
+ while (num_free-- > 1) {
+ term = *bptr--;
+ ESTACK_PUSH(s, term);
+ }
+ term = *bptr;
+ }
+ }
+ break;
+ case REFC_BINARY_SUBTAG:
+ case HEAP_BINARY_SUBTAG:
+ case SUB_BINARY_SUBTAG:
+ {
+ byte* bptr;
+ unsigned sz = binary_size(term);
+ Uint32 con = HCONST_13 + hash;
+ Uint bitoffs;
+ Uint bitsize;
+
+ ERTS_GET_BINARY_BYTES(term, bptr, bitoffs, bitsize);
+ if (sz == 0 && bitsize == 0) {
+ hash = con;
+ } else {
+ if (bitoffs == 0) {
+ hash = block_hash(bptr, sz, con);
+ if (bitsize > 0) {
+ UINT32_HASH_2(bitsize, (bptr[sz] >> (8 - bitsize)),
+ HCONST_15);
+ }
+ } else {
+ byte* buf = (byte *) erts_alloc(ERTS_ALC_T_TMP,
+ sz + (bitsize != 0));
+ erts_copy_bits(bptr, bitoffs, 1, buf, 0, 1, sz*8+bitsize);
+ hash = block_hash(buf, sz, con);
+ if (bitsize > 0) {
+ UINT32_HASH_2(bitsize, (buf[sz] >> (8 - bitsize)),
+ HCONST_15);
+ }
+ erts_free(ERTS_ALC_T_TMP, (void *) buf);
+ }
+ }
+ goto pop_next;
+ }
+ break;
+ case POS_BIG_SUBTAG:
+ case NEG_BIG_SUBTAG:
+ {
+ Eterm* ptr = big_val(term);
+ Uint i = 0;
+ Uint n = BIG_SIZE(ptr);
+ Uint32 con = BIG_SIGN(ptr) ? HCONST_10 : HCONST_11;
+#if D_EXP == 16
+ do {
+ Uint32 x, y;
+ x = i < n ? BIG_DIGIT(ptr, i++) : 0;
+ x += (Uint32)(i < n ? BIG_DIGIT(ptr, i++) : 0) << 16;
+ y = i < n ? BIG_DIGIT(ptr, i++) : 0;
+ y += (Uint32)(i < n ? BIG_DIGIT(ptr, i++) : 0) << 16;
+ UINT32_HASH_2(x, y, con);
+ } while (i < n);
+#elif D_EXP == 32
+ do {
+ Uint32 x, y;
+ x = i < n ? BIG_DIGIT(ptr, i++) : 0;
+ y = i < n ? BIG_DIGIT(ptr, i++) : 0;
+ UINT32_HASH_2(x, y, con);
+ } while (i < n);
+#elif D_EXP == 64
+ do {
+ Uint t;
+ Uint32 x, y;
+ ASSERT(i < n);
+ t = BIG_DIGIT(ptr, i++);
+ x = t & 0xffffffff;
+ y = t >> 32;
+ UINT32_HASH_2(x, y, con);
+ } while (i < n);
+#else
+#error "unsupported D_EXP size"
+#endif
+ goto pop_next;
+ }
+ break;
+ case REF_SUBTAG:
+ UINT32_HASH(internal_ref_numbers(term)[0], HCONST_7);
+ ASSERT(internal_ref_no_of_numbers(term) == 3);
+ UINT32_HASH_2(internal_ref_numbers(term)[1],
+ internal_ref_numbers(term)[2], HCONST_8);
+ goto pop_next;
+
+ case EXTERNAL_REF_SUBTAG:
+ {
+ ExternalThing* thing = external_thing_ptr(term);
+
+ ASSERT(external_thing_ref_no_of_numbers(thing) == 3);
+ /* See limitation #2 */
+ #ifdef ARCH_64
+ POINTER_HASH(thing->node, HCONST_7);
+ UINT32_HASH(external_thing_ref_numbers(thing)[0], HCONST_7);
+ #else
+ UINT32_HASH_2(thing->node,
+ external_thing_ref_numbers(thing)[0], HCONST_7);
+ #endif
+ UINT32_HASH_2(external_thing_ref_numbers(thing)[1],
+ external_thing_ref_numbers(thing)[2], HCONST_8);
+ goto pop_next;
+ }
+ case EXTERNAL_PID_SUBTAG: {
+ ExternalThing* thing = external_thing_ptr(term);
+ /* See limitation #2 */
+ #ifdef ARCH_64
+ POINTER_HASH(thing->node, HCONST_5);
+ UINT32_HASH(thing->data.ui[0], HCONST_5);
+ #else
+ UINT32_HASH_2(thing->node, thing->data.ui[0], HCONST_5);
+ #endif
+ goto pop_next;
+ }
+ case EXTERNAL_PORT_SUBTAG: {
+ ExternalThing* thing = external_thing_ptr(term);
+ /* See limitation #2 */
+ #ifdef ARCH_64
+ POINTER_HASH(thing->node, HCONST_6);
+ UINT32_HASH(thing->data.ui[0], HCONST_6);
+ #else
+ UINT32_HASH_2(thing->node, thing->data.ui[0], HCONST_6);
+ #endif
+ goto pop_next;
+ }
+ case FLOAT_SUBTAG:
+ {
+ FloatDef ff;
+ GET_DOUBLE(term, ff);
+ UINT32_HASH_2(ff.fw[0], ff.fw[1], HCONST_12);
+ goto pop_next;
+ }
+
+ default:
+ erl_exit(1, "Invalid tag in make_hash2(0x%X)\n", term);
+ }
+ }
+ break;
+ case TAG_PRIMARY_IMMED1:
+ #if ERTS_SIZEOF_ETERM == 8
+ UINT32_HASH_2((Uint32)term, (Uint32)(term >> 32), HCONST);
+ #else
+ UINT32_HASH(term, HCONST);
+ #endif
+ goto pop_next;
+
+ default:
+ erl_exit(1, "Invalid tag in make_hash2(0x%X)\n", term);
+
+ pop_next:
+ if (ESTACK_ISEMPTY(s)) {
+ DESTROY_ESTACK(s);
+ UnUseTmpHeapNoproc(2);
+ return hash;
+ }
+
+ term = ESTACK_POP(s);
+
+ switch (term) {
+ case HASH_MAP_TAIL: {
+ hash = (Uint32) ESTACK_POP(s);
+ UINT32_HASH(hash_xor_pairs, HCONST_19);
+ hash_xor_pairs = (Uint32) ESTACK_POP(s);
+ goto pop_next;
+ }
+ case HASH_MAP_PAIR:
+ hash_xor_pairs ^= hash;
hash = 0;
- goto hash2_common;
+ goto pop_next;
+
+ case HASH_CDR:
+ CONST_HASH(HCONST_18); /* Hash CDR i cons cell */
+ goto pop_next;
default:
break;
}
@@ -1478,9 +1951,10 @@ make_hash2(Eterm term)
}
}
+#undef CONST_HASH
#undef HASH_MAP_TAIL
-#undef HASH_MAP_KEY
-#undef HASH_MAP_VAL
+#undef HASH_MAP_PAIR
+#undef HASH_CDR
#undef UINT32_HASH_2
#undef UINT32_HASH
@@ -1697,21 +2171,9 @@ tail_recur:
break;
case MAP_DEF:
+ case HASHMAP_DEF:
{
- map_t *mp = (map_t *)map_val(term);
- int size = map_get_size(mp);
- Eterm *ks = map_get_keys(mp);
- Eterm *vs = map_get_values(mp);
-
- /* Use a prime with size to remedy some of
- * the {} and <<>> hash problems */
- hash = hash*FUNNY_NUMBER13 + FUNNY_NUMBER14 + size;
- if (size == 0)
- break;
-
- /* push values first */
- WSTACK_PUSH3(stack, (UWord)vs, (UWord) size, MAKE_HASH_TERM_ARRAY_OP);
- WSTACK_PUSH3(stack, (UWord)ks, (UWord) size, MAKE_HASH_TERM_ARRAY_OP);
+ hash = hash*FUNNY_NUMBER13 + FUNNY_NUMBER14 + make_hash2(term);
break;
}
case TUPLE_DEF:
@@ -2120,13 +2582,13 @@ tailrecur_ne:
}
case MAP_SUBTAG:
{
- aa = map_val_rel(a, a_base);
+ aa = flatmap_val_rel(a, a_base);
if (!is_boxed(b) || *boxed_val_rel(b,b_base) != *aa)
goto not_equal;
- bb = map_val_rel(b,b_base);
- sz = map_get_size((map_t*)aa);
+ bb = flatmap_val_rel(b,b_base);
+ sz = flatmap_get_size((flatmap_t*)aa);
- if (sz != map_get_size((map_t*)bb)) goto not_equal;
+ if (sz != flatmap_get_size((flatmap_t*)bb)) goto not_equal;
if (sz == 0) goto pop_next;
aa += 2;
@@ -2325,6 +2787,32 @@ tailrecur_ne:
}
break; /* not equal */
}
+ case HASHMAP_SUBTAG:
+ {
+ if (!is_boxed(b) || *boxed_val_rel(b,b_base) != hdr)
+ goto not_equal;
+
+ aa = hashmap_val_rel(a, a_base) + 1;
+ bb = hashmap_val_rel(b, b_base) + 1;
+ switch (hdr & _HEADER_MAP_SUBTAG_MASK) {
+ case HAMT_SUBTAG_HEAD_ARRAY:
+ aa++; bb++;
+ case HAMT_SUBTAG_NODE_ARRAY:
+ sz = 16;
+ break;
+ case HAMT_SUBTAG_HEAD_BITMAP:
+ aa++; bb++;
+ case HAMT_SUBTAG_NODE_BITMAP:
+ sz = hashmap_bitcount(MAP_HEADER_VAL(hdr));
+ ASSERT(sz > 0 && sz < 16);
+ break;
+ default:
+ erl_exit(1, "Unknown hashmap subsubtag\n");
+ }
+ goto term_array;
+ }
+ default:
+ ASSERT(!"Unknown boxed subtab in EQ");
}
break;
}
@@ -2448,7 +2936,18 @@ Sint erts_cmp_rel_opt(Eterm a, Eterm* a_base, Eterm b, Eterm* b_base, int exact)
Sint erts_cmp(Eterm a, Eterm b, int exact)
#endif
{
- DECLARE_WSTACK(stack);
+#define PSTACK_TYPE struct erts_cmp_hashmap_state
+ struct erts_cmp_hashmap_state {
+ Sint wstack_rollback;
+ int was_exact;
+ Eterm *ap;
+ Eterm *bp;
+ Eterm min_key;
+ Sint cmp_res; /* result so far -1,0,+1 */
+ };
+ PSTACK_DECLARE(hmap_stack, 1);
+ WSTACK_DECLARE(stack);
+ WSTACK_DECLARE(b_stack); /* only used by hashmaps */
Eterm* aa;
Eterm* bb;
int i;
@@ -2464,6 +2963,26 @@ Sint erts_cmp(Eterm a, Eterm b, int exact)
Uint32 *anum;
Uint32 *bnum;
+/* The WSTACK contains naked Eterms and Operations marked with header-tags */
+#define OP_BITS 4
+#define OP_MASK 0xF
+#define TERM_ARRAY_OP 0
+#define SWITCH_EXACT_OFF_OP 1
+#define HASHMAP_PHASE1_ARE_KEYS_EQUAL 2
+#define HASHMAP_PHASE1_IS_MIN_KEY 3
+#define HASHMAP_PHASE1_CMP_VALUES 4
+#define HASHMAP_PHASE2_ARE_KEYS_EQUAL 5
+#define HASHMAP_PHASE2_IS_MIN_KEY_A 6
+#define HASHMAP_PHASE2_IS_MIN_KEY_B 7
+
+
+#define OP_WORD(OP) (((OP) << _TAG_PRIMARY_SIZE) | TAG_PRIMARY_HEADER)
+#define TERM_ARRAY_OP_WORD(SZ) OP_WORD(((SZ) << OP_BITS) | TERM_ARRAY_OP)
+
+#define GET_OP(WORD) (ASSERT(is_header(WORD)), ((WORD) >> _TAG_PRIMARY_SIZE) & OP_MASK)
+#define GET_OP_ARG(WORD) (ASSERT(is_header(WORD)), ((WORD) >> (OP_BITS + _TAG_PRIMARY_SIZE)))
+
+
#define RETURN_NEQ(cmp) { j=(cmp); ASSERT(j != 0); goto not_equal; }
#define ON_CMP_GOTO(cmp) if ((j=(cmp)) == 0) goto pop_next; else goto not_equal
@@ -2479,6 +2998,8 @@ Sint erts_cmp(Eterm a, Eterm b, int exact)
} while (0)
+bodyrecur:
+ j = 0;
tailrecur:
if (is_same(a,a_base,b,b_base)) { /* Equal values or pointers. */
goto pop_next;
@@ -2606,24 +3127,83 @@ tailrecur_ne:
++bb;
goto term_array;
case (_TAG_HEADER_MAP >> _TAG_PRIMARY_SIZE) :
- if (!is_map_rel(b,b_base)) {
+ if (!is_flatmap_rel(b,b_base)) {
a_tag = MAP_DEF;
goto mixed_types;
}
- aa = (Eterm *)map_val_rel(a,a_base);
- bb = (Eterm *)map_val_rel(b,b_base);
+ aa = (Eterm *)flatmap_val_rel(a,a_base);
+ bb = (Eterm *)flatmap_val_rel(b,b_base);
- i = map_get_size((map_t*)aa);
- if (i != map_get_size((map_t*)bb)) {
- RETURN_NEQ((int)(i - map_get_size((map_t*)bb)));
+ i = flatmap_get_size((flatmap_t*)aa);
+ if (i != flatmap_get_size((flatmap_t*)bb)) {
+ RETURN_NEQ((int)(i - flatmap_get_size((flatmap_t*)bb)));
}
if (i == 0) {
goto pop_next;
}
aa += 2;
bb += 2;
- i += 1; /* increment for tuple-keys */
- goto term_array;
+ if (exact) {
+ i += 1; /* increment for tuple-keys */
+ goto term_array;
+ }
+ else {
+ /* Value array */
+ WSTACK_PUSH3(stack, (UWord)(bb+1), (UWord)(aa+1), TERM_ARRAY_OP_WORD(i));
+ /* Switch back from 'exact' key compare */
+ WSTACK_PUSH(stack, OP_WORD(SWITCH_EXACT_OFF_OP));
+ /* Now do 'exact' compare of key tuples */
+ a = *aa;
+ b = *bb;
+ exact = 1;
+ goto bodyrecur;
+ }
+
+ case (_TAG_HEADER_HASHMAP >> _TAG_PRIMARY_SIZE) :
+ {
+ struct erts_cmp_hashmap_state* sp;
+ if (!is_hashmap_rel(b,b_base)) {
+ a_tag = HASHMAP_DEF;
+ goto mixed_types;
+ }
+ i = hashmap_size_rel(a,a_base) - hashmap_size_rel(b,b_base);
+ if (i) {
+ RETURN_NEQ(i);
+ }
+ if (hashmap_size_rel(a,a_base) == 0) {
+ goto pop_next;
+ }
+
+ /* Hashmap compare strategy:
+ Phase 1. While keys are identical
+ Do synchronous stepping through leafs of both trees in hash
+ order. Maintain value compare result of minimal key.
+
+ Phase 2. If key diff was found in phase 1
+ Ignore values from now on.
+ Continue iterate trees by always advancing the one
+ lagging behind hash-wise. Identical keys are skipped.
+ A minimal key can only be candidate as tie-breaker if we
+ have passed that hash value in the other tree (which means
+ the key did not exist in the other tree).
+ */
+
+ sp = PSTACK_PUSH(hmap_stack);
+ hashmap_iterator_init(&stack, a, 0);
+ hashmap_iterator_init(&b_stack, b, 0);
+ sp->ap = hashmap_iterator_next(&stack);
+ sp->bp = hashmap_iterator_next(&b_stack);
+ sp->cmp_res = 0;
+ ASSERT(sp->ap && sp->bp);
+
+ a = CAR(sp->ap);
+ b = CAR(sp->bp);
+ sp->was_exact = exact;
+ exact = 1;
+ WSTACK_PUSH(stack, OP_WORD(HASHMAP_PHASE1_ARE_KEYS_EQUAL));
+ sp->wstack_rollback = WSTACK_COUNT(stack);
+ goto bodyrecur;
+ }
case (_TAG_HEADER_FLOAT >> _TAG_PRIMARY_SIZE):
if (!is_float_rel(b,b_base)) {
a_tag = FLOAT_DEF;
@@ -2983,8 +3563,7 @@ term_array: /* arrays in 'aa' and 'bb', length in 'i' */
goto not_equal;
}
} else {
- /* (ab)Use TAG_PRIMARY_HEADER to recognize a term_array */
- WSTACK_PUSH3(stack, i, (UWord)bb, (UWord)aa | TAG_PRIMARY_HEADER);
+ WSTACK_PUSH3(stack, (UWord)bb, (UWord)aa, TERM_ARRAY_OP_WORD(i));
goto tailrecur_ne;
}
}
@@ -2996,22 +3575,179 @@ term_array: /* arrays in 'aa' and 'bb', length in 'i' */
pop_next:
if (!WSTACK_ISEMPTY(stack)) {
UWord something = WSTACK_POP(stack);
- if (primary_tag((Eterm) something) == TAG_PRIMARY_HEADER) { /* a term_array */
- aa = (Eterm*) something;
- bb = (Eterm*) WSTACK_POP(stack);
- i = WSTACK_POP(stack);
- goto term_array;
+ struct erts_cmp_hashmap_state* sp;
+ if (primary_tag((Eterm) something) == TAG_PRIMARY_HEADER) { /* an operation */
+ switch (GET_OP(something)) {
+ case TERM_ARRAY_OP:
+ i = GET_OP_ARG(something);
+ aa = (Eterm*)WSTACK_POP(stack);
+ bb = (Eterm*) WSTACK_POP(stack);
+ goto term_array;
+
+ case SWITCH_EXACT_OFF_OP:
+ /* Done with exact compare of map keys, switch back */
+ ASSERT(exact);
+ exact = 0;
+ goto pop_next;
+
+ case HASHMAP_PHASE1_ARE_KEYS_EQUAL: {
+ sp = PSTACK_TOP(hmap_stack);
+ if (j) {
+ /* Key diff found, enter phase 2 */
+ if (hashmap_key_hash_cmp(sp->ap, sp->bp) < 0) {
+ sp->min_key = CAR(sp->ap);
+ sp->cmp_res = -1;
+ sp->ap = hashmap_iterator_next(&stack);
+ }
+ else {
+ sp->min_key = CAR(sp->bp);
+ sp->cmp_res = 1;
+ sp->bp = hashmap_iterator_next(&b_stack);
+ }
+ exact = 1; /* only exact key compares in phase 2 */
+ goto case_HASHMAP_PHASE2_LOOP;
+ }
+
+ /* No key diff found so far, compare values if min key */
+
+ if (sp->cmp_res) {
+ a = CAR(sp->ap);
+ b = sp->min_key;
+ exact = 1;
+ WSTACK_PUSH(stack, OP_WORD(HASHMAP_PHASE1_IS_MIN_KEY));
+ sp->wstack_rollback = WSTACK_COUNT(stack);
+ goto bodyrecur;
+ }
+ /* no min key-value found yet */
+ a = CDR(sp->ap);
+ b = CDR(sp->bp);
+ exact = sp->was_exact;
+ WSTACK_PUSH(stack, OP_WORD(HASHMAP_PHASE1_CMP_VALUES));
+ sp->wstack_rollback = WSTACK_COUNT(stack);
+ goto bodyrecur;
+ }
+ case HASHMAP_PHASE1_IS_MIN_KEY:
+ sp = PSTACK_TOP(hmap_stack);
+ if (j < 0) {
+ a = CDR(sp->ap);
+ b = CDR(sp->bp);
+ exact = sp->was_exact;
+ WSTACK_PUSH(stack, OP_WORD(HASHMAP_PHASE1_CMP_VALUES));
+ sp->wstack_rollback = WSTACK_COUNT(stack);
+ goto bodyrecur;
+ }
+ goto case_HASHMAP_PHASE1_LOOP;
+
+ case HASHMAP_PHASE1_CMP_VALUES:
+ sp = PSTACK_TOP(hmap_stack);
+ if (j) {
+ sp->cmp_res = j;
+ sp->min_key = CAR(sp->ap);
+ }
+ case_HASHMAP_PHASE1_LOOP:
+ sp->ap = hashmap_iterator_next(&stack);
+ sp->bp = hashmap_iterator_next(&b_stack);
+ if (!sp->ap) {
+ /* end of maps with identical keys */
+ ASSERT(!sp->bp);
+ j = sp->cmp_res;
+ exact = sp->was_exact;
+ (void) PSTACK_POP(hmap_stack);
+ ON_CMP_GOTO(j);
+ }
+ a = CAR(sp->ap);
+ b = CAR(sp->bp);
+ exact = 1;
+ WSTACK_PUSH(stack, OP_WORD(HASHMAP_PHASE1_ARE_KEYS_EQUAL));
+ sp->wstack_rollback = WSTACK_COUNT(stack);
+ goto bodyrecur;
+
+ case_HASHMAP_PHASE2_LOOP:
+ if (sp->ap && sp->bp) {
+ a = CAR(sp->ap);
+ b = CAR(sp->bp);
+ ASSERT(exact);
+ WSTACK_PUSH(stack, OP_WORD(HASHMAP_PHASE2_ARE_KEYS_EQUAL));
+ sp->wstack_rollback = WSTACK_COUNT(stack);
+ goto bodyrecur;
+ }
+ goto case_HASHMAP_PHASE2_NEXT_STEP;
+
+ case HASHMAP_PHASE2_ARE_KEYS_EQUAL:
+ sp = PSTACK_TOP(hmap_stack);
+ if (j == 0) {
+ /* keys are equal, skip them */
+ sp->ap = hashmap_iterator_next(&stack);
+ sp->bp = hashmap_iterator_next(&b_stack);
+ goto case_HASHMAP_PHASE2_LOOP;
+ }
+ /* fall through */
+ case_HASHMAP_PHASE2_NEXT_STEP:
+ if (sp->ap || sp->bp) {
+ if (hashmap_key_hash_cmp(sp->ap, sp->bp) < 0) {
+ ASSERT(sp->ap);
+ a = CAR(sp->ap);
+ b = sp->min_key;
+ ASSERT(exact);
+ WSTACK_PUSH(stack, OP_WORD(HASHMAP_PHASE2_IS_MIN_KEY_A));
+ }
+ else { /* hash_cmp > 0 */
+ ASSERT(sp->bp);
+ a = CAR(sp->bp);
+ b = sp->min_key;
+ ASSERT(exact);
+ WSTACK_PUSH(stack, OP_WORD(HASHMAP_PHASE2_IS_MIN_KEY_B));
+ }
+ sp->wstack_rollback = WSTACK_COUNT(stack);
+ goto bodyrecur;
+ }
+ /* End of both maps */
+ j = sp->cmp_res;
+ exact = sp->was_exact;
+ (void) PSTACK_POP(hmap_stack);
+ ON_CMP_GOTO(j);
+
+ case HASHMAP_PHASE2_IS_MIN_KEY_A:
+ sp = PSTACK_TOP(hmap_stack);
+ if (j < 0) {
+ sp->min_key = CAR(sp->ap);
+ sp->cmp_res = -1;
+ }
+ sp->ap = hashmap_iterator_next(&stack);
+ goto case_HASHMAP_PHASE2_LOOP;
+
+ case HASHMAP_PHASE2_IS_MIN_KEY_B:
+ sp = PSTACK_TOP(hmap_stack);
+ if (j < 0) {
+ sp->min_key = CAR(sp->bp);
+ sp->cmp_res = 1;
+ }
+ sp->bp = hashmap_iterator_next(&b_stack);
+ goto case_HASHMAP_PHASE2_LOOP;
+
+ default:
+ ASSERT(!"Invalid cmp op");
+ } /* switch */
}
a = (Eterm) something;
b = (Eterm) WSTACK_POP(stack);
goto tailrecur;
}
- DESTROY_WSTACK(stack);
+ ASSERT(PSTACK_IS_EMPTY(hmap_stack));
+ PSTACK_DESTROY(hmap_stack);
+ WSTACK_DESTROY(stack);
+ WSTACK_DESTROY(b_stack);
return 0;
not_equal:
- DESTROY_WSTACK(stack);
+ if (!PSTACK_IS_EMPTY(hmap_stack)) {
+ WSTACK_ROLLBACK(stack, PSTACK_TOP(hmap_stack)->wstack_rollback);
+ goto pop_next;
+ }
+ PSTACK_DESTROY(hmap_stack);
+ WSTACK_DESTROY(stack);
+ WSTACK_DESTROY(b_stack);
return j;
#undef CMP_NODES
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-24 06:58:42 +0000