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-rw-r--r--erts/emulator/beam/utils.c264
1 files changed, 5 insertions, 259 deletions
diff --git a/erts/emulator/beam/utils.c b/erts/emulator/beam/utils.c
index 3fa48da1ec..74a0681dd5 100644
--- a/erts/emulator/beam/utils.c
+++ b/erts/emulator/beam/utils.c
@@ -700,12 +700,7 @@ erts_bld_atom_2uint_3tup_list(Uint **hpp, Uint *szp, Sint length,
/* make a hash index from an erlang term */
/*
-** There are three hash functions.
-** make_broken_hash: the one used for backward compatibility
-** is called from the bif erlang:hash/2. Should never be used
-** as it a) hashes only a part of binaries, b) hashes bignums really poorly,
-** c) hashes bignums differently on different endian processors and d) hashes
-** small integers with different weights on different bytes.
+** There are two hash functions.
**
** make_hash: A hash function that will give the same values for the same
** terms regardless of the internal representation. Small integers are
@@ -1045,6 +1040,10 @@ tail_recur:
DESTROY_WSTACK(stack);
return hash;
+#undef MAKE_HASH_TUPLE_OP
+#undef MAKE_HASH_TERM_ARRAY_OP
+#undef MAKE_HASH_CDR_PRE_OP
+#undef MAKE_HASH_CDR_POST_OP
#undef UINT32_HASH_STEP
#undef UINT32_HASH_RET
}
@@ -1954,259 +1953,6 @@ make_internal_hash(Eterm term)
#undef HCONST
#undef MIX
-
-Uint32 make_broken_hash(Eterm term)
-{
- Uint32 hash = 0;
- DECLARE_WSTACK(stack);
- unsigned op;
-tail_recur:
- op = tag_val_def(term);
- for (;;) {
- switch (op) {
- case NIL_DEF:
- hash = hash*FUNNY_NUMBER3 + 1;
- break;
- case ATOM_DEF:
- hash = hash*FUNNY_NUMBER1 +
- (atom_tab(atom_val(term))->slot.bucket.hvalue);
- break;
- case SMALL_DEF:
-#if defined(ARCH_64)
- {
- Sint y1 = signed_val(term);
- Uint y2 = y1 < 0 ? -(Uint)y1 : y1;
- Uint32 y3 = (Uint32) (y2 >> 32);
- int arity = 1;
-
-#if defined(WORDS_BIGENDIAN)
- if (!IS_SSMALL28(y1))
- { /* like a bignum */
- Uint32 y4 = (Uint32) y2;
- hash = hash*FUNNY_NUMBER2 + ((y4 << 16) | (y4 >> 16));
- if (y3) {
- hash = hash*FUNNY_NUMBER2 + ((y3 << 16) | (y3 >> 16));
- arity++;
- }
- hash = hash * (y1 < 0 ? FUNNY_NUMBER3 : FUNNY_NUMBER2) + arity;
- } else {
- hash = hash*FUNNY_NUMBER2 + (((Uint) y1) & 0xfffffff);
- }
-#else
- if (!IS_SSMALL28(y1))
- { /* like a bignum */
- hash = hash*FUNNY_NUMBER2 + ((Uint32) y2);
- if (y3)
- {
- hash = hash*FUNNY_NUMBER2 + y3;
- arity++;
- }
- hash = hash * (y1 < 0 ? FUNNY_NUMBER3 : FUNNY_NUMBER2) + arity;
- } else {
- hash = hash*FUNNY_NUMBER2 + (((Uint) y1) & 0xfffffff);
- }
-#endif
- }
-#else
- hash = hash*FUNNY_NUMBER2 + unsigned_val(term);
-#endif
- break;
-
- case BINARY_DEF:
- {
- size_t sz = binary_size(term);
- size_t i = (sz < 15) ? sz : 15;
-
- hash = hash_binary_bytes(term, i, hash);
- hash = hash*FUNNY_NUMBER4 + sz;
- break;
- }
-
- case EXPORT_DEF:
- {
- Export* ep = *((Export **) (export_val(term) + 1));
-
- hash = hash * FUNNY_NUMBER11 + ep->info.mfa.arity;
- hash = hash*FUNNY_NUMBER1 +
- (atom_tab(atom_val(ep->info.mfa.module))->slot.bucket.hvalue);
- hash = hash*FUNNY_NUMBER1 +
- (atom_tab(atom_val(ep->info.mfa.function))->slot.bucket.hvalue);
- break;
- }
-
- case FUN_DEF:
- {
- ErlFunThing* funp = (ErlFunThing *) fun_val(term);
- Uint num_free = funp->num_free;
-
- hash = hash * FUNNY_NUMBER10 + num_free;
- hash = hash*FUNNY_NUMBER1 +
- (atom_tab(atom_val(funp->fe->module))->slot.bucket.hvalue);
- hash = hash*FUNNY_NUMBER2 + funp->fe->old_index;
- hash = hash*FUNNY_NUMBER2 + funp->fe->old_uniq;
- if (num_free > 0) {
- if (num_free > 1) {
- WSTACK_PUSH3(stack, (UWord) &funp->env[1], (num_free-1), MAKE_HASH_TERM_ARRAY_OP);
- }
- term = funp->env[0];
- goto tail_recur;
- }
- break;
- }
-
- case PID_DEF:
- hash = hash*FUNNY_NUMBER5 + internal_pid_number(term);
- break;
- case EXTERNAL_PID_DEF:
- hash = hash*FUNNY_NUMBER5 + external_pid_number(term);
- break;
- case PORT_DEF:
- hash = hash*FUNNY_NUMBER9 + internal_port_number(term);
- break;
- case EXTERNAL_PORT_DEF:
- hash = hash*FUNNY_NUMBER9 + external_port_number(term);
- break;
- case REF_DEF:
- hash = hash*FUNNY_NUMBER9 + internal_ref_numbers(term)[0];
- break;
- case EXTERNAL_REF_DEF:
- hash = hash*FUNNY_NUMBER9 + external_ref_numbers(term)[0];
- break;
- case FLOAT_DEF:
- {
- FloatDef ff;
- GET_DOUBLE(term, ff);
- if (ff.fd == 0.0f) {
- /* ensure positive 0.0 */
- ff.fd = erts_get_positive_zero_float();
- }
- hash = hash*FUNNY_NUMBER6 + (ff.fw[0] ^ ff.fw[1]);
- }
- break;
- case MAKE_HASH_CDR_PRE_OP:
- term = (Eterm) WSTACK_POP(stack);
- if (is_not_list(term)) {
- WSTACK_PUSH(stack, (UWord) MAKE_HASH_CDR_POST_OP);
- goto tail_recur;
- }
- /*fall through*/
- case LIST_DEF:
- {
- Eterm* list = list_val(term);
- WSTACK_PUSH2(stack, (UWord) CDR(list),
- (UWord) MAKE_HASH_CDR_PRE_OP);
- term = CAR(list);
- goto tail_recur;
- }
-
- case MAKE_HASH_CDR_POST_OP:
- hash *= FUNNY_NUMBER8;
- break;
-
- case BIG_DEF:
- {
- Eterm* ptr = big_val(term);
- int is_neg = BIG_SIGN(ptr);
- Uint arity = BIG_ARITY(ptr);
- Uint i = arity;
- ptr++;
-#if D_EXP == 16
- /* hash over 32 bit LE */
-
- while(i--) {
- hash = hash*FUNNY_NUMBER2 + *ptr++;
- }
-#elif D_EXP == 32
-
-#if defined(WORDS_BIGENDIAN)
- while(i--) {
- Uint d = *ptr++;
- hash = hash*FUNNY_NUMBER2 + ((d << 16) | (d >> 16));
- }
-#else
- while(i--) {
- hash = hash*FUNNY_NUMBER2 + *ptr++;
- }
-#endif
-
-#elif D_EXP == 64
- {
- Uint32 h = 0, l;
-#if defined(WORDS_BIGENDIAN)
- while(i--) {
- Uint d = *ptr++;
- l = d & 0xffffffff;
- h = d >> 32;
- hash = hash*FUNNY_NUMBER2 + ((l << 16) | (l >> 16));
- if (h || i)
- hash = hash*FUNNY_NUMBER2 + ((h << 16) | (h >> 16));
- }
-#else
- while(i--) {
- Uint d = *ptr++;
- l = d & 0xffffffff;
- h = d >> 32;
- hash = hash*FUNNY_NUMBER2 + l;
- if (h || i)
- hash = hash*FUNNY_NUMBER2 + h;
- }
-#endif
- /* adjust arity to match 32 bit mode */
- arity = (arity << 1) - (h == 0);
- }
-
-#else
-#error "unsupported D_EXP size"
-#endif
- hash = hash * (is_neg ? FUNNY_NUMBER3 : FUNNY_NUMBER2) + arity;
- }
- break;
-
- case MAP_DEF:
- hash = hash*FUNNY_NUMBER13 + FUNNY_NUMBER14 + make_hash2(term);
- break;
- case TUPLE_DEF:
- {
- Eterm* ptr = tuple_val(term);
- Uint arity = arityval(*ptr);
-
- WSTACK_PUSH3(stack, (UWord) arity, (UWord) (ptr+1), (UWord) arity);
- op = MAKE_HASH_TUPLE_OP;
- }/*fall through*/
- case MAKE_HASH_TUPLE_OP:
- case MAKE_HASH_TERM_ARRAY_OP:
- {
- Uint i = (Uint) WSTACK_POP(stack);
- Eterm* ptr = (Eterm*) WSTACK_POP(stack);
- if (i != 0) {
- term = *ptr;
- WSTACK_PUSH3(stack, (UWord)(ptr+1), (UWord) i-1, (UWord) op);
- goto tail_recur;
- }
- if (op == MAKE_HASH_TUPLE_OP) {
- Uint32 arity = (UWord) WSTACK_POP(stack);
- hash = hash*FUNNY_NUMBER9 + arity;
- }
- break;
- }
-
- default:
- erts_exit(ERTS_ERROR_EXIT, "Invalid tag in make_broken_hash\n");
- return 0;
- }
- if (WSTACK_ISEMPTY(stack)) break;
- op = (Uint) WSTACK_POP(stack);
- }
-
- DESTROY_WSTACK(stack);
- return hash;
-
-#undef MAKE_HASH_TUPLE_OP
-#undef MAKE_HASH_TERM_ARRAY_OP
-#undef MAKE_HASH_CDR_PRE_OP
-#undef MAKE_HASH_CDR_POST_OP
-}
-
static Eterm
do_allocate_logger_message(Eterm gleader, Eterm **hp, ErlOffHeap **ohp,
ErlHeapFragment **bp, Process **p, Uint sz)
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-10 14:29:54 +0000