[k2] throw error on accessing RuntimeContext before InstanceState initialization (#1576)

Author: apolyakov

runtime-light/core/kphp-core-impl/kphp-core-context.cpp

@@ -3,13 +3,22 @@
 // Distributed under the GPL v3 License, see LICENSE.notice.txt
 
 #include "runtime-common/core/runtime-core.h"
+#include "runtime-light/k2-platform/k2-api.h"
 #include "runtime-light/state/instance-state.h"
+#include "runtime-light/stdlib/diagnostics/logs.h"
+
+namespace {
 
 constexpr string_size_type initial_minimum_string_buffer_length = 1024;
 constexpr string_size_type initial_maximum_string_buffer_length = (1 << 24);
 
+} // namespace
+
 RuntimeContext& RuntimeContext::get() noexcept {
-  return InstanceState::get().runtime_context;
+  if (auto* instance_state_ptr{k2::instance_state()}; instance_state_ptr != nullptr) [[likely]] {
+    return instance_state_ptr->runtime_context;
+  }
+  kphp::log::error("unexpected access to RuntimeContext");
 }
 
 void RuntimeContext::init() noexcept {