removed 'roots', replaced with a registry table

- removed cosmoM_addRoot
- removed cosmoM_removeRoot
- renamed cosmoV_register to cosmoV_addGlobals
- added cosmoV_addRegistry
- added cosmoV_getRegistry
- added cosmoV_setProto
- added cosmoV_isValueUserType

src/cstate.h

@@ -18,6 +18,7 @@ struct CCallFrame
 typedef enum IStringEnum
 {
     ISTRING_INIT,     // __init
+    ISTRING_GC,       // __gc
     ISTRING_TOSTRING, // __tostring
     ISTRING_TONUMBER, // __tonumber
     ISTRING_EQUAL,    // __equals
@@ -56,6 +57,7 @@ struct CState
     CObjObject *protoObjects[COBJ_MAX]; // proto object for each COBJ type [NULL = no default proto]
     CObjString *iStrings[ISTRING_MAX];  // strings used internally by the VM, eg. __init, __index
     CTable strings;
+    CTable registry;
     ArrayCObj grayStack; // keeps track of which objects *haven't yet* been traversed in our GC, but
                          // *have been* found
 
@@ -63,14 +65,12 @@ struct CState
     CObjTable *globals;
     CValue *top;     // top of the stack
     CObj *objects;   // tracks all of our allocated objects
-    CObj *userRoots; // user definable roots, this holds CObjs that should be considered "roots",
-                     // lets the VM know you are holding a reference to a CObj in your code
     CPanic *panic;
 
-    int freezeGC; // when > 0, GC events will be ignored (for internal use)
-    int frameCount;
     size_t allocatedBytes;
     size_t nextGC; // when allocatedBytes reaches this threshhold, trigger a GC event
+    int freezeGC; // when > 0, GC events will be ignored (for internal use)
+    int frameCount;
 };
 
 CPanic *cosmoV_newPanic(CState *state);
@@ -80,7 +80,16 @@ COSMO_API CState *cosmoV_newState();
 COSMO_API void cosmoV_freeState(CState *state);
 
 // expects 2*pairs values on the stack, each pair should consist of 1 key and 1 value
-COSMO_API void cosmoV_register(CState *state, int pairs);
+COSMO_API void cosmoV_addGlobals(CState *state, int pairs);
+
+// expects 2*pairs values on the stack, each pair should consist of 1 key and 1 value
+COSMO_API void cosmoV_addRegistry(CState *state, int pairs);
+
+// expects 1 key on the stack, pushes result
+COSMO_API void cosmoV_getRegistry(CState *state);
+
+// expects <object>->proto = <object> (2 total) to be on the stack
+COSMO_API void cosmoV_setProto(CState *state);
 
 COSMO_API void cosmoV_printStack(CState *state);