diff --git a/src/cs_util.hh b/src/cs_util.hh
index ded5c18..affc376 100644
--- a/src/cs_util.hh
+++ b/src/cs_util.hh
@@ -3,6 +3,7 @@
 
 #include <type_traits>
 #include <unordered_map>
+#include <vector>
 
 #include <ostd/string.hh>
 
@@ -40,7 +41,56 @@ inline void cs_do_and_cleanup(F1 &&dof, F2 &&clf) {
     dof();
 }
 
-struct cs_shared_state;
+struct cs_strman;
+
+struct cs_shared_state {
+    cs_map<ostd::string_range, cs_ident *> idents;
+    cs_vector<cs_ident *> identmap;
+    cs_alloc_cb allocf;
+    cs_vprint_cb varprintf;
+    cs_strman *strman;
+    void *aptr;
+
+    void *alloc(void *ptr, size_t os, size_t ns) {
+        return allocf(aptr, ptr, os, ns);
+    }
+
+    template<typename T, typename ...A>
+    T *create(A &&...args) {
+        T *ret = static_cast<T *>(alloc(nullptr, 0, sizeof(T)));
+        new (ret) T(std::forward<A>(args)...);
+        return ret;
+    }
+
+    template<typename T>
+    T *create_array(size_t len) {
+        T *ret = static_cast<T *>(alloc(nullptr, 0, len * sizeof(T)));
+        for (size_t i = 0; i < len; ++i) {
+            new (&ret[i]) T();
+        }
+        return ret;
+    }
+
+    template<typename T>
+    void destroy(T *v) noexcept {
+        v->~T();
+        alloc(v, sizeof(T), 0);
+    }
+
+    template<typename T>
+    void destroy_array(T *v, size_t len) noexcept {
+        v->~T();
+        alloc(v, len * sizeof(T), 0);
+    }
+};
+
+inline cs_shared_state *cs_get_sstate(cs_state &cs) {
+    return cs.p_state;
+}
+
+inline cs_strref cs_make_strref(char const *p, cs_shared_state &cs) {
+    return cs_strref{p, cs};
+}
 
 /* string manager
  *
diff --git a/src/cs_vm.hh b/src/cs_vm.hh
index a63b1ce..f6525f0 100644
--- a/src/cs_vm.hh
+++ b/src/cs_vm.hh
@@ -114,55 +114,6 @@ enum {
     CS_CODE_FLAG_FALSE = 0 << CS_CODE_RET
 };
 
-struct cs_shared_state {
-    cs_map<ostd::string_range, cs_ident *> idents;
-    cs_vector<cs_ident *> identmap;
-    cs_alloc_cb allocf;
-    cs_vprint_cb varprintf;
-    cs_strman *strman;
-    void *aptr;
-
-    void *alloc(void *ptr, size_t os, size_t ns) {
-        return allocf(aptr, ptr, os, ns);
-    }
-
-    template<typename T, typename ...A>
-    T *create(A &&...args) {
-        T *ret = static_cast<T *>(alloc(nullptr, 0, sizeof(T)));
-        new (ret) T(std::forward<A>(args)...);
-        return ret;
-    }
-
-    template<typename T>
-    T *create_array(size_t len) {
-        T *ret = static_cast<T *>(alloc(nullptr, 0, len * sizeof(T)));
-        for (size_t i = 0; i < len; ++i) {
-            new (&ret[i]) T();
-        }
-        return ret;
-    }
-
-    template<typename T>
-    void destroy(T *v) noexcept {
-        v->~T();
-        alloc(v, sizeof(T), 0);
-    }
-
-    template<typename T>
-    void destroy_array(T *v, size_t len) noexcept {
-        v->~T();
-        alloc(v, len * sizeof(T), 0);
-    }
-};
-
-inline cs_shared_state *cs_get_sstate(cs_state &cs) {
-    return cs.p_state;
-}
-
-inline cs_strref cs_make_strref(char const *p, cs_shared_state &cs) {
-    return cs_strref{p, cs};
-}
-
 struct CsBreakException {
 };
 
diff --git a/src/lib_str.cc b/src/lib_str.cc
index 0bd197f..bf53750 100644
--- a/src/lib_str.cc
+++ b/src/lib_str.cc
@@ -3,7 +3,6 @@
 #include <cubescript/cubescript.hh>
 
 #include "cs_util.hh"
-#include "cs_vm.hh"
 
 namespace cscript {
 
@@ -66,11 +65,11 @@ void cs_init_lib_string(cs_state &cs) {
         }
         auto const *cbuf = ics->strman->steal(buf);
         auto sr = cs_make_strref(cbuf, *ics);
-        sman->unref(cbuf);
+        ics->strman->unref(cbuf);
         res.set_str(sr);
     });
 
-    cs.new_command("strupper", "s", [](auto &, auto args, auto &res) {
+    cs.new_command("strupper", "s", [](auto &ccs, auto args, auto &res) {
         auto inps = ostd::string_range{args[0].get_str()};
         auto *ics = cs_get_sstate(ccs);
         auto *buf = ics->strman->alloc_buf(inps.size());
@@ -79,7 +78,7 @@ void cs_init_lib_string(cs_state &cs) {
         }
         auto const *cbuf = ics->strman->steal(buf);
         auto sr = cs_make_strref(cbuf, *ics);
-        sman->unref(cbuf);
+        ics->strman->unref(cbuf);
         res.set_str(sr);
     });