From 141c3755814cea60888c7ee548c7ce709550b784 Mon Sep 17 00:00:00 2001 From: reduz Date: Sat, 18 Jun 2022 16:20:55 +0200 Subject: Clean up Hash Functions Clean up and do fixes to hash functions and newly introduced murmur3 hashes in #61934 * Clean up usage of murmur3 * Fixed usages of binary murmur3 on floats (this is invalid) * Changed DJB2 to use xor (which seems to be better) --- core/object/callable_method_pointer.cpp | 4 +-- core/object/class_db.cpp | 52 ++++++++++++++++----------------- core/object/method_bind.cpp | 25 +++++++--------- 3 files changed, 38 insertions(+), 43 deletions(-) (limited to 'core/object') diff --git a/core/object/callable_method_pointer.cpp b/core/object/callable_method_pointer.cpp index 1bf926cafc..81f8ab6be2 100644 --- a/core/object/callable_method_pointer.cpp +++ b/core/object/callable_method_pointer.cpp @@ -85,9 +85,9 @@ void CallableCustomMethodPointerBase::_setup(uint32_t *p_base_ptr, uint32_t p_pt // Precompute hash. for (uint32_t i = 0; i < comp_size; i++) { if (i == 0) { - h = hash_djb2_one_32(comp_ptr[i]); + h = hash_murmur3_one_32(comp_ptr[i]); } else { - h = hash_djb2_one_32(comp_ptr[i], h); + h = hash_murmur3_one_32(comp_ptr[i], h); } } } diff --git a/core/object/class_db.cpp b/core/object/class_db.cpp index 533cb6e789..3c9f373d12 100644 --- a/core/object/class_db.cpp +++ b/core/object/class_db.cpp @@ -164,7 +164,7 @@ uint64_t ClassDB::get_api_hash(APIType p_api) { OBJTYPE_RLOCK; #ifdef DEBUG_METHODS_ENABLED - uint64_t hash = hash_djb2_one_64(HashMapHasherDefault::hash(VERSION_FULL_CONFIG)); + uint64_t hash = hash_murmur3_one_64(HashMapHasherDefault::hash(VERSION_FULL_CONFIG)); List class_list; ClassDB::get_class_list(&class_list); @@ -177,8 +177,8 @@ uint64_t ClassDB::get_api_hash(APIType p_api) { if (t->api != p_api || !t->exposed) { continue; } - hash = hash_djb2_one_64(t->name.hash(), hash); - hash = hash_djb2_one_64(t->inherits.hash(), hash); + hash = hash_murmur3_one_64(t->name.hash(), hash); + hash = hash_murmur3_one_64(t->inherits.hash(), hash); { //methods @@ -200,27 +200,27 @@ uint64_t ClassDB::get_api_hash(APIType p_api) { for (const StringName &F : snames) { MethodBind *mb = t->method_map[F]; - hash = hash_djb2_one_64(mb->get_name().hash(), hash); - hash = hash_djb2_one_64(mb->get_argument_count(), hash); - hash = hash_djb2_one_64(mb->get_argument_type(-1), hash); //return + hash = hash_murmur3_one_64(mb->get_name().hash(), hash); + hash = hash_murmur3_one_64(mb->get_argument_count(), hash); + hash = hash_murmur3_one_64(mb->get_argument_type(-1), hash); //return for (int i = 0; i < mb->get_argument_count(); i++) { const PropertyInfo info = mb->get_argument_info(i); - hash = hash_djb2_one_64(info.type, hash); - hash = hash_djb2_one_64(info.name.hash(), hash); - hash = hash_djb2_one_64(info.hint, hash); - hash = hash_djb2_one_64(info.hint_string.hash(), hash); + hash = hash_murmur3_one_64(info.type, hash); + hash = hash_murmur3_one_64(info.name.hash(), hash); + hash = hash_murmur3_one_64(info.hint, hash); + hash = hash_murmur3_one_64(info.hint_string.hash(), hash); } - hash = hash_djb2_one_64(mb->get_default_argument_count(), hash); + hash = hash_murmur3_one_64(mb->get_default_argument_count(), hash); for (int i = 0; i < mb->get_default_argument_count(); i++) { //hash should not change, i hope for tis Variant da = mb->get_default_argument(i); - hash = hash_djb2_one_64(da.hash(), hash); + hash = hash_murmur3_one_64(da.hash(), hash); } - hash = hash_djb2_one_64(mb->get_hint_flags(), hash); + hash = hash_murmur3_one_64(mb->get_hint_flags(), hash); } } @@ -235,8 +235,8 @@ uint64_t ClassDB::get_api_hash(APIType p_api) { snames.sort_custom(); for (const StringName &F : snames) { - hash = hash_djb2_one_64(F.hash(), hash); - hash = hash_djb2_one_64(t->constant_map[F], hash); + hash = hash_murmur3_one_64(F.hash(), hash); + hash = hash_murmur3_one_64(t->constant_map[F], hash); } } @@ -252,9 +252,9 @@ uint64_t ClassDB::get_api_hash(APIType p_api) { for (const StringName &F : snames) { MethodInfo &mi = t->signal_map[F]; - hash = hash_djb2_one_64(F.hash(), hash); + hash = hash_murmur3_one_64(F.hash(), hash); for (int i = 0; i < mi.arguments.size(); i++) { - hash = hash_djb2_one_64(mi.arguments[i].type, hash); + hash = hash_murmur3_one_64(mi.arguments[i].type, hash); } } } @@ -273,23 +273,23 @@ uint64_t ClassDB::get_api_hash(APIType p_api) { PropertySetGet *psg = t->property_setget.getptr(F); ERR_FAIL_COND_V(!psg, 0); - hash = hash_djb2_one_64(F.hash(), hash); - hash = hash_djb2_one_64(psg->setter.hash(), hash); - hash = hash_djb2_one_64(psg->getter.hash(), hash); + hash = hash_murmur3_one_64(F.hash(), hash); + hash = hash_murmur3_one_64(psg->setter.hash(), hash); + hash = hash_murmur3_one_64(psg->getter.hash(), hash); } } //property list for (const PropertyInfo &F : t->property_list) { - hash = hash_djb2_one_64(F.name.hash(), hash); - hash = hash_djb2_one_64(F.type, hash); - hash = hash_djb2_one_64(F.hint, hash); - hash = hash_djb2_one_64(F.hint_string.hash(), hash); - hash = hash_djb2_one_64(F.usage, hash); + hash = hash_murmur3_one_64(F.name.hash(), hash); + hash = hash_murmur3_one_64(F.type, hash); + hash = hash_murmur3_one_64(F.hint, hash); + hash = hash_murmur3_one_64(F.hint_string.hash(), hash); + hash = hash_murmur3_one_64(F.usage, hash); } } - return hash; + return hash_fmix32(hash); #else return 0; #endif diff --git a/core/object/method_bind.cpp b/core/object/method_bind.cpp index a208c1a2b2..a4474ea53b 100644 --- a/core/object/method_bind.cpp +++ b/core/object/method_bind.cpp @@ -35,32 +35,27 @@ #include "method_bind.h" uint32_t MethodBind::get_hash() const { - uint32_t hash = hash_djb2_one_32(has_return() ? 1 : 0); - hash = hash_djb2_one_32(get_argument_count(), hash); - -#ifndef _MSC_VER -#warning This needs proper class name and argument type for hashing -#endif -#if 0 + uint32_t hash = hash_murmur3_one_32(has_return() ? 1 : 0); + hash = hash_murmur3_one_32(get_argument_count(), hash); for (int i = (has_return() ? -1 : 0); i < get_argument_count(); i++) { PropertyInfo pi = i == -1 ? get_return_info() : get_argument_info(i); - hash = hash_djb2_one_32(get_argument_type(i), hash); + hash = hash_murmur3_one_32(get_argument_type(i), hash); if (pi.class_name != StringName()) { - hash = hash_djb2_one_32(pi.class_name.operator String().hash(), hash); + hash = hash_murmur3_one_32(pi.class_name.operator String().hash(), hash); } } -#endif - hash = hash_djb2_one_32(get_default_argument_count(), hash); + + hash = hash_murmur3_one_32(get_default_argument_count(), hash); for (int i = 0; i < get_default_argument_count(); i++) { Variant v = get_default_argument(i); - hash = hash_djb2_one_32(v.hash(), hash); + hash = hash_murmur3_one_32(v.hash(), hash); } - hash = hash_djb2_one_32(is_const(), hash); - hash = hash_djb2_one_32(is_vararg(), hash); + hash = hash_murmur3_one_32(is_const(), hash); + hash = hash_murmur3_one_32(is_vararg(), hash); - return hash; + return hash_fmix32(hash); } PropertyInfo MethodBind::get_argument_info(int p_argument) const { -- cgit v1.2.3