diff --git a/builtin-functions/kphp-light/stdlib/rpc.txt b/builtin-functions/kphp-light/stdlib/rpc.txt
index 90211d0d7f..9b64e6035f 100644
--- a/builtin-functions/kphp-light/stdlib/rpc.txt
+++ b/builtin-functions/kphp-light/stdlib/rpc.txt
@@ -113,6 +113,8 @@ function rpc_queue_push ($queue_id ::: int, $request_id ::: int) ::: void;
 
 function rpc_queue_empty ($queue_id ::: int) ::: bool;
 
+function rpc_parse ($data) ::: bool;
+
 /** @kphp-extern-func-info interruptible */
 function rpc_queue_next ($queue_id ::: int, $timeout ::: float = -1.0) ::: int | false;
 
@@ -121,9 +123,6 @@ function rpc_queue_next ($queue_id ::: int, $timeout ::: float = -1.0) ::: int |
 /** @kphp-extern-func-info interruptible stub generation-required */
 function new_rpc_connection ($str ::: string, $port ::: int, $actor_id ::: mixed = 0, $timeout ::: float = 0.3, $connect_timeout ::: float = 0.3, $reconnect_timeout ::: float = 17.0) ::: \RpcConnection; // TODO: make actor_id int
 
-/** @kphp-extern-func-info stub */
-function rpc_parse ($data) ::: bool;
-
 /** @kphp-extern-func-info interruptible stub generation-required */
 function store_finish() ::: bool;
 
diff --git a/builtin-functions/kphp-light/stdlib/serialize-functions.txt b/builtin-functions/kphp-light/stdlib/serialize-functions.txt
index e39aa0acb5..8e429a964a 100644
--- a/builtin-functions/kphp-light/stdlib/serialize-functions.txt
+++ b/builtin-functions/kphp-light/stdlib/serialize-functions.txt
@@ -48,13 +48,15 @@ function msgpack_serialize($v ::: mixed) ::: string | null;
 
 function msgpack_deserialize($v ::: string) ::: mixed;
 
+/** @kphp-extern-func-info can_throw */
+function instance_serialize_safe(object $instance) ::: string;
+
+/** @kphp-extern-func-info cpp_template_call can_throw */
+function instance_deserialize_safe($serialized ::: string, $to_type ::: string) ::: instance<^2>;
+
 // ===== UNSUPPORTED =====
 
 /** @kphp-extern-func-info can_throw stub generation-required */
 function msgpack_serialize_safe($v ::: mixed) ::: string;
 /** @kphp-extern-func-info can_throw stub generation-required */
 function msgpack_deserialize_safe($v ::: string) ::: mixed;
-/** @kphp-extern-func-info can_throw stub */
-function instance_serialize_safe(object $instance) ::: string;
-/** @kphp-extern-func-info cpp_template_call can_throw stub */
-function instance_deserialize_safe($serialized ::: string, $to_type ::: string) ::: instance<^2>;
diff --git a/builtin-functions/kphp-light/stdlib/server-functions.txt b/builtin-functions/kphp-light/stdlib/server-functions.txt
index 6318fd793b..5a62421a11 100644
--- a/builtin-functions/kphp-light/stdlib/server-functions.txt
+++ b/builtin-functions/kphp-light/stdlib/server-functions.txt
@@ -65,6 +65,10 @@ function memory_get_usage ($real_usage ::: bool = false) ::: int;
 
 function memory_get_peak_usage ($real_usage ::: bool = false) ::: int;
 
+function setlocale ($category ::: int, $locale ::: string) ::: string | false;
+
+function memory_get_detailed_stats() ::: int[];
+
 // ===== UNSUPPORTED =====
 
 /** @kphp-extern-func-info stub */
@@ -94,8 +98,6 @@ function inet_pton ($address ::: string) ::: string | false;
 function memory_get_total_usage() ::: int;
 /** @kphp-extern-func-info stub generation-required */
 function memory_get_static_usage() ::: int;
-/** @kphp-extern-func-info stub generation-required */
-function memory_get_detailed_stats() ::: int[];
 
 /** @kphp-extern-func-info stub */
 function kphp_extended_instance_cache_metrics_init(callable(string $key):string $normalization_function) ::: void;
@@ -118,9 +120,6 @@ define('LC_NUMERIC', 1);
 define('LC_TIME', 2);
 define('LC_MESSAGES', 5);
 
-/** @kphp-extern-func-info stub generation-required */
-function setlocale ($category ::: int, $locale ::: string) ::: string | false;
-
 function debug_backtrace() ::: string[][];
 
 /** @kphp-extern-func-info stub generation-required */
diff --git a/runtime-light/k2-platform/k2-api.h b/runtime-light/k2-platform/k2-api.h
index 165e00286c..8884086177 100644
--- a/runtime-light/k2-platform/k2-api.h
+++ b/runtime-light/k2-platform/k2-api.h
@@ -292,6 +292,18 @@ inline struct tm* localtime_r(const time_t* timer, struct tm* result) noexcept {
   return k2_localtime_r(timer, result);
 }
 
+inline int32_t uselocale(int32_t category, std::string_view locale) noexcept {
+  return k2_uselocale(category, locale.data());
+}
+
+inline std::optional<std::string_view> current_locale_name(int32_t category) noexcept {
+  auto* name{k2_current_locale_name(category)};
+  if (name == nullptr) [[unlikely]] {
+    return std::nullopt;
+  }
+  return std::string_view{name};
+}
+
 inline int32_t udp_connect(k2::descriptor* descriptor, const char* host, size_t host_len) noexcept {
   return k2_udp_connect(descriptor, host, host_len);
 }
diff --git a/runtime-light/stdlib/diagnostics/exception-functions.h b/runtime-light/stdlib/diagnostics/exception-functions.h
index fb2fda357a..5acb20662b 100644
--- a/runtime-light/stdlib/diagnostics/exception-functions.h
+++ b/runtime-light/stdlib/diagnostics/exception-functions.h
@@ -6,6 +6,8 @@
 
 #include <concepts>
 #include <cstdint>
+#include <source_location>
+#include <utility>
 
 #include "runtime-common/core/runtime-core.h"
 #include "runtime-light/stdlib/diagnostics/exception-types.h"
@@ -65,17 +67,22 @@
 namespace kphp::exception {
 
 template<std::derived_from<C$Throwable> T>
-class_instance<T> make_throwable(const string& file, int64_t line, int64_t code, const string& desc) noexcept {
+class_instance<T> make_throwable(string file, int64_t line, int64_t code, string desc) noexcept {
   auto instance{make_instance<T>()};
 
   auto* instance_ptr{instance.get()};
-  instance_ptr->$file = file;
+  instance_ptr->$file = std::move(file);
   instance_ptr->$line = line;
   instance_ptr->$code = code;
-  instance_ptr->$message = desc;
+  instance_ptr->$message = std::move(desc);
   return instance;
 }
 
+template<std::derived_from<C$Throwable> T>
+class_instance<T> make_throwable(string err_msg, int64_t code = 0, std::source_location loc = std::source_location::current()) noexcept {
+  return make_throwable<T>(string{loc.file_name()}, loc.line(), code, std::move(err_msg));
+}
+
 } // namespace kphp::exception
 
 // ================================================================================================
@@ -87,6 +94,7 @@ T f$_exception_set_location(const T& e, const string& file, int64_t line) noexce
   return e;
 }
 
-inline Exception f$err(const string& file, int64_t line, const string& code, const string& desc = {}) noexcept {
-  return kphp::exception::make_throwable<C$Exception>(file, line, 0, (RuntimeContext::get().static_SB.clean() << "ERR_" << code << ": " << desc).str());
+inline Exception f$err(string file, int64_t line, const string& code, const string& desc = {}) noexcept {
+  return kphp::exception::make_throwable<C$Exception>(std::move(file), line, 0,
+                                                      (RuntimeContext::get().static_SB.clean() << "ERR_" << code << ": " << desc).str());
 }
diff --git a/runtime-light/stdlib/memory/memory-usage.h b/runtime-light/stdlib/memory/memory-usage.h
index 61955b6b55..d43383c634 100644
--- a/runtime-light/stdlib/memory/memory-usage.h
+++ b/runtime-light/stdlib/memory/memory-usage.h
@@ -5,8 +5,10 @@
 #pragma once
 
 #include <cstdint>
+#include <utility>
 
 #include "runtime-common/core/allocator/runtime-allocator.h"
+#include "runtime-common/core/runtime-core.h"
 
 inline int64_t f$memory_get_peak_usage(bool real_usage = false) noexcept {
   if (real_usage) {
@@ -19,3 +21,16 @@ inline int64_t f$memory_get_peak_usage(bool real_usage = false) noexcept {
 inline int64_t f$memory_get_usage([[maybe_unused]] bool real_usage = false) noexcept {
   return static_cast<int64_t>(RuntimeAllocator::get().memory_resource.get_memory_stats().memory_used);
 }
+
+inline array<int64_t> f$memory_get_detailed_stats() noexcept {
+  const auto& stats{RuntimeAllocator::get().memory_resource.get_memory_stats()};
+  return array<int64_t>({std::make_pair(string{"memory_limit"}, static_cast<int64_t>(stats.memory_limit)),
+                         std::make_pair(string{"real_memory_used"}, static_cast<int64_t>(stats.real_memory_used)),
+                         std::make_pair(string{"memory_used"}, static_cast<int64_t>(stats.memory_used)),
+                         std::make_pair(string{"max_real_memory_used"}, static_cast<int64_t>(stats.max_real_memory_used)),
+                         std::make_pair(string{"max_memory_used"}, static_cast<int64_t>(stats.max_memory_used)),
+                         std::make_pair(string{"defragmentation_calls"}, static_cast<int64_t>(stats.defragmentation_calls)),
+                         std::make_pair(string{"huge_memory_pieces"}, static_cast<int64_t>(stats.huge_memory_pieces)),
+                         std::make_pair(string{"small_memory_pieces"}, static_cast<int64_t>(stats.small_memory_pieces)),
+                         std::make_pair(string{"heap_memory_used"}, static_cast<int64_t>(0))});
+}
diff --git a/runtime-light/stdlib/rpc/rpc-api.h b/runtime-light/stdlib/rpc/rpc-api.h
index f7b5913ce3..f10da91c60 100644
--- a/runtime-light/stdlib/rpc/rpc-api.h
+++ b/runtime-light/stdlib/rpc/rpc-api.h
@@ -170,9 +170,33 @@ inline bool f$rpc_clean() noexcept {
   return true;
 }
 
-template<typename T>
-bool f$rpc_parse(T /*unused*/) {
-  kphp::log::error("call to unsupported function");
+inline bool f$rpc_parse(const string& new_rpc_data) noexcept {
+  if (new_rpc_data.size() % sizeof(int32_t) != 0) {
+    kphp::log::warning("wrong parameter \"new_rpc_data\" of len {} passed to function rpc_parse", new_rpc_data.size());
+    return false;
+  }
+
+  const std::span<const std::byte> spn{reinterpret_cast<const std::byte*>(new_rpc_data.c_str()), new_rpc_data.size()};
+  RpcServerInstanceState::get().tl_storer.store_bytes(spn);
+  return true;
+}
+
+inline bool f$rpc_parse(const mixed& new_rpc_data) noexcept {
+  if (!new_rpc_data.is_string()) {
+    kphp::log::warning("parameter 1 of function rpc_parse must be a string, {} is given", new_rpc_data.get_type_c_str());
+    return false;
+  }
+
+  return f$rpc_parse(new_rpc_data.to_string());
+}
+
+inline bool f$rpc_parse(bool new_rpc_data) noexcept {
+  return f$rpc_parse(mixed{new_rpc_data});
+}
+
+inline bool f$rpc_parse(const Optional<string>& new_rpc_data) noexcept {
+  constexpr auto rpc_parse_lambda{[](const auto& v) noexcept { return f$rpc_parse(v); }};
+  return call_fun_on_optional_value(rpc_parse_lambda, new_rpc_data);
 }
 
 // f$rpc_server_fetch_request() definition is generated into the tl/rpc_server_fetch_request.cpp file.
diff --git a/runtime-light/stdlib/serialization/msgpack-functions.h b/runtime-light/stdlib/serialization/msgpack-functions.h
index c378719019..472d57d90e 100644
--- a/runtime-light/stdlib/serialization/msgpack-functions.h
+++ b/runtime-light/stdlib/serialization/msgpack-functions.h
@@ -4,8 +4,13 @@
 
 #pragma once
 
+#include <memory>
+#include <utility>
+
 #include "runtime-common/core/runtime-core.h"
 #include "runtime-common/stdlib/msgpack/unpacker.h"
+#include "runtime-common/stdlib/serialization/msgpack-functions.h"
+#include "runtime-light/stdlib/diagnostics/exception-functions.h"
 #include "runtime-light/stdlib/diagnostics/logs.h"
 #include "runtime-light/stdlib/serialization/serialization-state.h"
 
@@ -51,11 +56,24 @@ ResultClass f$instance_deserialize(const string& buffer, const string& /*unused*
 }
 
 template<class InstanceClass>
-string f$instance_serialize_safe(const class_instance<InstanceClass>& /*instance*/) noexcept {
-  kphp::log::error("call to unsupported function");
+string f$instance_serialize_safe(const class_instance<InstanceClass>& instance) noexcept {
+  string err_msg;
+  auto result{msgpack_functions_impl_::common_instance_serialize(instance, std::addressof(err_msg))};
+  if (!err_msg.empty()) {
+    THROW_EXCEPTION(kphp::exception::make_throwable<C$Exception>(std::move(err_msg)));
+    return {};
+  }
+  kphp::log::assertion(result.has_value());
+  return result.val();
 }
 
 template<class ResultClass>
-ResultClass f$instance_deserialize_safe(const string& /*buffer*/, const string& /*unused*/) noexcept {
-  kphp::log::error("call to unsupported function");
+ResultClass f$instance_deserialize_safe(const string& buffer, const string& /*unused*/) noexcept {
+  string err_msg;
+  auto res{f$msgpack_deserialize<ResultClass>(buffer, std::addressof(err_msg))};
+  if (!err_msg.empty()) {
+    THROW_EXCEPTION(kphp::exception::make_throwable<C$Exception>(std::move(err_msg)));
+    return {};
+  }
+  return res;
 }
diff --git a/runtime-light/stdlib/string/string-functions.h b/runtime-light/stdlib/string/string-functions.h
new file mode 100644
index 0000000000..28b7ad35c6
--- /dev/null
+++ b/runtime-light/stdlib/string/string-functions.h
@@ -0,0 +1,22 @@
+// Compiler for PHP (aka KPHP)
+// Copyright (c) 2025 LLC «V Kontakte»
+// Distributed under the GPL v3 License, see LICENSE.notice.txt
+
+#pragma once
+
+#include <cstdint>
+
+#include "runtime-common/core/runtime-core.h"
+#include "runtime-light/k2-platform/k2-api.h"
+
+inline Optional<string> f$setlocale(int64_t category, const string& locale) noexcept {
+  const int32_t i32category{static_cast<int32_t>(category)};
+  if (k2::uselocale(i32category, {locale.c_str(), locale.size()}) != k2::errno_ok) {
+    return false;
+  }
+  const auto opt_locale_name{k2::current_locale_name(i32category)};
+  if (!opt_locale_name.has_value()) [[unlikely]] {
+    return false;
+  }
+  return opt_locale_name->data();
+}
diff --git a/runtime/rpc.cpp b/runtime/rpc.cpp
index c9e947f0c3..ecfaf06853 100644
--- a/runtime/rpc.cpp
+++ b/runtime/rpc.cpp
@@ -138,7 +138,7 @@ void rpc_parse(const int32_t* new_rpc_data, int32_t new_rpc_data_len) {
   rpc_data_len = new_rpc_data_len;
 }
 
-bool f$rpc_parse(const string& new_rpc_data) {
+bool f$rpc_parse(const string& new_rpc_data) noexcept {
   if (new_rpc_data.size() % sizeof(int) != 0) {
     php_warning("Wrong parameter \"new_rpc_data\" of len %d passed to function rpc_parse", (int)new_rpc_data.size());
     last_rpc_error = "Result's length is not divisible by 4";
@@ -157,7 +157,7 @@ bool f$rpc_parse(const string& new_rpc_data) {
   return true;
 }
 
-bool f$rpc_parse(const mixed& new_rpc_data) {
+bool f$rpc_parse(const mixed& new_rpc_data) noexcept {
   if (!new_rpc_data.is_string()) {
     php_warning("Parameter 1 of function rpc_parse must be a string, %s is given", new_rpc_data.get_type_c_str());
     return false;
@@ -166,12 +166,12 @@ bool f$rpc_parse(const mixed& new_rpc_data) {
   return f$rpc_parse(new_rpc_data.to_string());
 }
 
-bool f$rpc_parse(bool new_rpc_data) {
+bool f$rpc_parse(bool new_rpc_data) noexcept {
   return f$rpc_parse(mixed{new_rpc_data});
 }
 
-bool f$rpc_parse(const Optional<string>& new_rpc_data) {
-  auto rpc_parse_lambda = [](const auto& v) { return f$rpc_parse(v); };
+bool f$rpc_parse(const Optional<string>& new_rpc_data) noexcept {
+  constexpr auto rpc_parse_lambda = [](const auto& v) noexcept { return f$rpc_parse(v); };
   return call_fun_on_optional_value(rpc_parse_lambda, new_rpc_data);
 }
 
diff --git a/runtime/rpc.h b/runtime/rpc.h
index 740c314115..7fc2032c71 100644
--- a/runtime/rpc.h
+++ b/runtime/rpc.h
@@ -65,13 +65,13 @@ void last_rpc_error_reset();
 
 void rpc_parse(const int32_t* new_rpc_data, int32_t new_rpc_data_len);
 
-bool f$rpc_parse(const string& new_rpc_data);
+bool f$rpc_parse(const string& new_rpc_data) noexcept;
 
-bool f$rpc_parse(const mixed& new_rpc_data);
+bool f$rpc_parse(const mixed& new_rpc_data) noexcept;
 
-bool f$rpc_parse(bool new_rpc_data);
+bool f$rpc_parse(bool new_rpc_data) noexcept;
 
-bool f$rpc_parse(const Optional<string>& new_rpc_data);
+bool f$rpc_parse(const Optional<string>& new_rpc_data) noexcept;
 
 int32_t rpc_get_pos();